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Encyclopedia > Ejaculation

Ejaculation is the ejecting of semen from the penis, and is usually accompanied by orgasm. It is usually the result of sexual stimulation, which may include prostate stimulation. Rarely, it is due to prostatic disease. Ejaculation may occur spontaneously during sleep (a nocturnal emission). Anejaculation is the condition of being unable to ejaculate. Horse semen being collected for breeding purposes. ... The penis (plural penises, penes) is an external male sexual organ. ... Orgasm is the conclusion of the plateau phase of the sexual response cycle, shared by both men and women. ... This article or section does not cite its references or sources. ... The prostate is an exocrine gland of the male mammalian reproductive system. ... Sleep is the state of natural rest observed in most mammals, birds, fish, as well as invertebrates such as the fruitfly Drosophila. ... A nocturnal emission is an ejaculation of semen experienced during sleep. ...

Diagram of the Male Reproductive System
Diagram of the Male Reproductive System

Contents

Image File history File links Illu_repdt_male_Erect. ... Image File history File links Illu_repdt_male_Erect. ...

About

The process of ejaculation is an intense sensation, part of orgasm (French "la petite mort" - the little death), which can be immensely pleasureable and satisfying. Each spurt is associated with a wave of sexual pleasure, especially in the penis and loins. The first and second convulsions are usually the most intense in sensation, and produce the greatest quantity of semen. Thereafter, each contraction is associated with a diminishing volume of semen and a milder wave of pleasure. During sexual intercourse or masturbation, most males will find it difficult to resist the psychological temptation to continue the stimulation of the penis to the point of ejaculation once the feeling of orgasm becomes imminent. Orgasm is the conclusion of the plateau phase of the sexual response cycle, shared by both men and women. ... The little death is a translation from the French la petite mort (Le Petit Mort/Le Petit Morte/La petite morte), a popular reference for a sexual orgasm. ... The loins are the part of the body on either side of the backbone, between the ribs and pelvis. ... // WorldSex Daily Updated Free Links to Hardcore Sex Pictures, Movies, Free Porn Videos and XXX Live Sex Cams. ... Mulher sentada de coxas abertas, 1916 drawing by Gustav Klimt Masturbation refers to sexual stimulation, particularly of ones own genitals and often to the point of orgasm, which is performed manually, by other types of bodily contact (except for sexual intercourse), by use of objects or tools, or by...

Example of male ejaculation.
Example of male ejaculation.

Ejaculation has two phases: emission and ejaculation proper. The emission phase of the ejaculatory reflex is under control of the sympathetic nervous system, while the ejaculatory phase is under control of a spinal reflex at the level of the spinal nerves S2-4 via the pudendal nerve. During emission, the two ducts known as vas deferens contract to propel sperm from the epididymis where it was stored up to the ampullae at the top end of the vas deferens. The beginning of emission is typically experienced as a "point of no return," also known as point of ejaculatory inevitability. The sperm then passes through the ejaculatory ducts and is mixed with fluids from the seminal vesicles, the prostate, and the bulbourethral glands to form the semen, or ejaculate. During ejaculation proper, the semen is ejected through the urethra with rhythmic contractions.[1] Image File history File links Ejaculation_sample. ... Image File history File links Ejaculation_sample. ... Grays FIG. 838– The right sympathetic chain and its connections with the thoracic, abdominal, and pelvic plexuses. ... Tendon reflex (or T-reflex) is a feedback mechanism that controls increasing muscle tension by causing muscle relaxation before tension force becomes so great it may damage the muscle The sensory receptor that detects change in tension is the golgi tendon which lie within tendon. ... The term spinal nerve generally refers to the mixed spinal nerve, which is formed from the dorsal and ventral roots that come out of the spinal cord. ... The pudendal nerve is responsible for orgasm, urination, and defecation in both sexes. ... The vas deferens, also called ductus deferens, (Latin: carrying-away vessel) is part of the male anatomy of some species, including humans. ... The signifier sperm can refer to: (mass noun, from Greek sperma = seed) a substance which consists of spermatozoa and which is a component of semen (mass noun) semen itself (informally, count noun with plural sperm or sperms) a single spermatozoon (= sperm cell) sperma ceti (Latin ceti, genitive of cetus = whale... Male Anatomy The epididymis is part of the human male reproductive system and is present in all male mammals. ... The ampulla of Vater is a sphincter (a small muscle) where the common bile duct enters the duodenum. ... The Ejaculatory ducts are part of the human male anatomy, which cause the reflex action of ejaculation. ... Male Anatomy The seminal vesicles are a pair of glands on the posterior surface of the urinary bladder of males. ... The prostate is an exocrine gland of the male mammalian reproductive system. ... The bulbourethral glands (or Cowpers glands) secrete a clear fluid known as pre-ejaculate or Cowpers fluid (colloquially known as pre-cum) which is generated upon sexual arousal. ... Horse semen being collected for breeding purposes. ... In anatomy, the urethra is a tube which connects the urinary bladder to the outside of the body. ...


These rhythmic contractions are part of the male orgasm. The typical male orgasm lasts about 17 seconds but can vary from a few seconds up to about a minute[citation needed]. After the start of orgasm, pulses of semen begin to flow from the urethra, reach a peak discharge and then diminish in flow. The typical orgasm consists of 10 to 15 contractions[citation needed]. The rate of contractions gradually slows during the orgasm. Initial contractions occur at an average interval of 0.6 seconds with an increasing increment of 0.1 second per contraction. Contractions of most men procede at regular rhythmic intervals for the duration of the orgasm. Many men also experience additional irregular contractions at the conclusion of the orgasm.[2]


Semen begins to spurt from the penis during the first or second contraction of orgasm. For most men the first spurt occurs during the second contraction. A small study of seven men found the initial spurt occurring on the first contraction for 2 men and occurring on the second contraction for 5 men. This same study showed between 26 and 60 percent of the contractions during orgasm were accompanied by a spurt of semen.[3]


The force and amount of ejaculate vary widely from male to male. A normal ejaculation may contain anywhere from 1.5 to 5 milliliters.[4] Ejaculate volume is affected by the amount of time that has passed since the previous ejaculation. Larger ejaculate volumes are seen with greater durations of abstinence. However, a recent Australian study has suggested a positive correlation between prostate cancer and infrequent ejaculation and/or prostate milking, which performs essentially the same function.[5] Also, the duration of the stimulation leading up to the ejaculation can affect the volume. Abnormally low volume is known as hypospermia, though it is normal for the amount of ejaculate to diminish with age. In physics, force is an influence that may cause a body to accelerate. ... The millilitre (ml or mL, also spelt milliliter) is a metric unit of volume that is equal to one thousandth of a litre. ... Prostate cancer is a disease in which cancer develops in the prostate, a gland in the male reproductive system. ... Prostate milking refers to the sexual practice of relieving the buildup of semen by regular prostate massage, thus preventing the need for ejaculation at other times. ... Hypospermia is the medical term when a man has an unusually low ejaculate (or semen) volume. ...

  • Video of an ejaculating penis ( file info)
    • Educational Demonstration of Ejaculation
    • In case of problems, see media help.

The number of sperm in an ejaculation also varies widely, depending on many factors, including the recentness of last ejaculation, the average warmth of the testicles, the degree and length of time of sexual excitement prior to ejaculation, the age, testosterone level, the nutrition and especially hydration and the total volume of seminal fluid. An unusually low sperm count, not the same as low semen volume, is known as oligospermia, and the absence of any sperm from the ejaculate is termed azoospermia. Image File history File links Ejaculation_Educational_Demonstration. ... The signifier sperm can refer to: (mass noun, from Greek sperma = seed) a substance which consists of spermatozoa and which is a component of semen (mass noun) semen itself (informally, count noun with plural sperm or sperms) a single spermatozoon (= sperm cell) sperma ceti (Latin ceti, genitive of cetus = whale... The testicles, or testes (singular testis), are the male generative glands in animals. ... This does not cite its references or sources. ... Volume is how much space a thing has. ... Oligospermia, also know as Oligozoospermia, is a medical symptom affecting men. ... Azoospermia is the medical condition of a man not having any measurable level of sperm in his semen. ...


Most men experience a lag time between the ability to ejaculate consecutively, and this lag time varies among men. Age also affects the recovery time; younger men typically recover faster than older men. During this refractory period it is difficult or impossible to attain an erection, because the sympathetic nervous system counteracts the effects of the parasympathetic nervous system. In sexual intercourse, the refractory period is a recovery phase after male ejaculation during which it is physiologically impossible for almost all men to experience sustained erection and additional ejaculations or orgasms. ...


There are wide variations in how long sexual intercourse can last before ejaculation occurs. // WorldSex Daily Updated Free Links to Hardcore Sex Pictures, Movies, Free Porn Videos and XXX Live Sex Cams. ...


When a man ejaculates before he wants to it is called premature ejaculation. If a man is unable to ejaculate in a timely manner after prolonged sexual stimulation, in spite of his desire to do so, it is called delayed ejaculation or anorgasmia. An orgasm that is not accompanied by ejaculation is known as a dry orgasm. Premature ejaculation (PE), also known as rapid ejaculation, premature climax, early ejaculation, or by the Latin term ejaculatio praecox, is the most common sexual problem in men, affecting 20%-30% of men. ... Delayed ejaculation refers to an inhibition of ejaculation. ... Anorgasmia (also known as Retarded Ejaculation in males) is a form of sexual dysfunction, sometimes classified as a psychiatric disorder, where the patient cannot achieve orgasm, even with adequate stimulation. ... This article or section does not cite its references or sources. ...


Central nervous system control

To map the neuronal activation of the brain during the ejaculatory response, researchers have studied the expression of c-fos, a proto-oncogene expressed in neurons in response to stimulation by hormones and neurotransmitters [6] Expression of c-fos in the following areas have been observed: [7],[8]

  • medial preoptic area (MPOA)
  • lateral septum, bed nucleus of the stria terminalis
  • paraventricular nucleus of the hypothalamus (PVN)
  • ventromedial hypothalamus, medial amygdala
  • ventral premammillary nuclei
  • ventral tegmentum
  • central tegmental field
  • mesencephalic central gray
  • peripeduncular nuclei
  • parvocellular subparafascicular nucleus (SPF) within the posterior thalamus

Fertilization

Normally, ejaculation is required for emission of sperm, which can fertilize a woman's egg and impregnate her. However, almost all men produce a small amount of pre-ejaculate fluid when their penis is erect and they are sexually stimulated, and this pre-ejaculate may contain some sperm which can also lead to pregnancy. For this reason, coitus interruptus may still lead to unwanted pregnancies for couples engaging in vaginal intercourse if other forms of birth control are not used as well. The signifier sperm can refer to: (mass noun, from Greek sperma = seed) a substance which consists of spermatozoa and which is a component of semen (mass noun) semen itself (informally, count noun with plural sperm or sperms) a single spermatozoon (= sperm cell) sperma ceti (Latin ceti, genitive of cetus = whale... Look up egg in Wiktionary, the free dictionary. ... A spermatozoon fertilising an ovum Fertilisation or fertilization (also known as conception, fecundation and syngamy), is fusion of gametes to form a new organism of the same species. ... Precum. ... Coitus interruptus, also known as withdrawal or the pull out method, is a method of contraception in which, during sexual intercourse, the man removes his penis from the womans vagina just before he reaches orgasm. ... Birth control is a regimen of one or more actions, devices, or medications followed in order to deliberately prevent or reduce the likelihood of a woman becoming pregnant or giving birth. ...


Euphemisms

Because sexual topics are often an uncomfortable topic among peers, a huge variety of euphemisms and dysphemisms have been invented to describe ejaculation and semen. For a complete list of terms, see: "Sexual slang". A euphemism is an expression intended by the speaker to be less offensive, disturbing, or troubling to the listener than the word or phrase it replaces, or in the case of doublespeak to make it less troublesome for the speaker. ... In language, both dysphemism (from the Greek dys δυς= non and pheme φήμη = speech) and cacophemism (in Greek cacos κακός = bad) are rough opposites of euphemism, meaning the usage of an intentionally harsh word or expression instead of a polite one. ... Sexual slang is any slang term which makes reference to sex, the sexual organs, or matters closely related to them. ...


Ejaculation facts

  • Average energy in a tablespoon of semen: 2-7 kcalories, 8-29 kilojoules
  • Average number of sperm cells in the ejaculate of a healthy man: 40 million to 600 million (avg. 250 million)
  • Distance sperm travels to fertilize an egg: 7.5-10 centimeters or 3-4 inches
  • Sperm lifespan: 2.5 months from development to ejaculation
  • Sperm lifespan after ejaculation: 30 seconds to 6 days depending on conditions

A calorie refers to a unit of energy. ... The joule (symbol J, also called newton metre, or coulomb volt) is the SI unit of energy and work. ... The contents of the Sperm article were merged into this article and now redirects here. ... The signifier sperm can refer to: (mass noun, from Greek sperma = seed) a substance which consists of spermatozoa and which is a component of semen (mass noun) semen itself (informally, count noun with plural sperm or sperms) a single spermatozoon (= sperm cell) sperma ceti (Latin ceti, genitive of cetus = whale... A human ovum Sperm cells attempting to fertilize an ovum An ovum (plural ova) is a haploid female reproductive cell or gamete. ... cm redirects here, alternate uses: cm (disambiguation) A centimetre (symbol cm; American spelling: centimeter) is an SI unit of length. ... Mid-19th century tool for converting between different standards of the inch An inch is an Imperial unit of length. ...

See also

Aspermia ... Azoospermia is the medical condition of a man not having any measurable level of sperm in his semen. ... Coitus interruptus, also known as withdrawal or the pull out method, is a method of contraception in which, during sexual intercourse, the man removes his penis from the womans vagina just before he reaches orgasm. ... Coitus reservatus, also known as karezza, is a form of sexual intercourse in which the man does not attempt to ejaculate within the woman, but instead attempts to remain at the plateau phase of intercourse for as long as possible. ... Delayed ejaculation refers to an inhibition of ejaculation. ... The erection of the penis, clitoris or a nipple is its enlarged and firm state. ... Statue depicting female emissions from an ancient Hindu temple in Karnataka, India, c. ... Premature ejaculation (PE), also known as rapid ejaculation, premature climax, early ejaculation, or by the Latin term ejaculatio praecox, is the most common sexual problem in men, affecting 20%-30% of men. ... // Retrograde ejaculation in males In males, retrograde ejaculation occurs when the fluid to be ejaculated, which would normally exit via the urethra, is redirected towards the urinary bladder. ...

References

  1. ^ Walter F. Boron, Emile L. Boulpaep, (2005). Medical Physiology: A Cellular and Molecular Approach. Philadelphia, PA: Elsevier/Saunders. ISBN 1-4160-2328-3. 
  2. ^ Bolen, J. G., "The male orgasm: pelvic contractions measured by anal probe," Archives of Sexual Behavior, 1980 Dec;9(6):503-21.
  3. ^ Gerstenburg, T. C. "Erection and ejaculation in man. Assessment of the electromyographic activity of the bulbocavernosus and ischiocavernosus muscles", British Journal of Urology, 1990 Apr;65(4):395-402.
  4. ^ "Swimming Toward Conception: The Semen Analysis," Focus on Fertility, American Infertility Association and Organon Pharmaceuticals USA Inc.
  5. ^ http://news.bbc.co.uk/2/hi/health/3072021.stm "Masturbation Cuts Cancer Risk," BBC News Online 16 July 2003
  6. ^ Sagar SM, "et al.", "Expression of c-fos protein in brain: metabolic mapping at the cellular level", Science 240:1328-1332.
  7. ^ Pfaus JG and Heeb MM, "Implications of immediate-early gene induction in the brain following sexual stimulation of female and male rodents", Brain Res Bull, 1997 44:397-407.
  8. ^ Veening JG and Coolen LM, "Neural activation following sexual behavior in the male and female rat brain.", Behav Brain Res, 1998 92:181-193.

External links

  • Sexual Medicine Society of North America's website: SexHealthMatters.org
  • The Ejaculation and the Ejaculate

McGraw-Hill Human Sexuality Image Bank illustrations

  • Male genitals during the sexual response cycle (1)
  • Male genitals during the sexual response cycle (2)
  • Male and female genitals during intercourse
  • Retrograde ejaculation

  Results from FactBites:
 
Ejaculation (425 words)
When a male ejaculates his muscles contract, and sperm and semen mix and are pushed into the urethra and come spurting out of the opening in the glans, or tip, of the penis.
Stopping the ejaculation, by covering the end of the penis with a finger or thumb, can cause "retrograde ejaculation," which means the semen travels back up the urethra and can be forced up the tube that leads to the bladder, or forced into the prostate gland.
A wet dream is a term to describe an ejaculation from the penis during sleep.
  More results at FactBites »

 
 

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