Ejaculation is Muscle son anal job with ejaculation discharge of semen normally containing sperm from the male reproductory tractusually accompanied by orgasm. It is the final stage and natural objective of male sexual stimulationand an essential component of natural conception.
In rare cases, ejaculation occurs because of prostatic disease. Ejaculation may also occur spontaneously during sleep a nocturnal emission or "wet dream". Anejaculation is the condition of being unable to ejaculate. Ejaculation is usually very pleasurable for men; dysejaculation is an ejaculation that is painful or uncomfortable.
Retrograde ejaculation is the condition where semen travels backwards into the bladder rather than out the urethra. A usual precursor to ejaculation is the sexual arousal of the male, leading to the erection of the penisthough not every arousal nor erection leads to ejaculation.
Penile sexual stimulation during masturbation or vaginalanaloral Muscle son anal job with ejaculation, or non-penetrative sexual activity may provide the necessary stimulus for a man to achieve orgasm and ejaculation. While the presence of sperm in pre-ejaculatory fluid is thought to be rare, sperm from an earlier ejaculation, still present in the urethramay be picked up by pre-ejaculatory fluid. Premature ejaculation is when ejaculation occurs before the desired time. 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 Muscle son anal job with ejaculation a dry orgasm. When a man has achieved a sufficient level of stimulation, the orgasm and ejaculation begins. At that point, under the control of the sympathetic nervous systemsemen containing sperm is produced emission.
They are generated by the bulbospongiosus and pubococcygeus muscles  under the control of a spinal reflex at the level of the spinal nerves S2—4 via the pudendal nerve. The typical male orgasm lasts several seconds. 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, although the man is unlikely to be consciously aware of that many. Once the first contraction has taken place, ejaculation will continue to completion as an involuntary process.
At this stage, ejaculation cannot be stopped. The rate of contractions gradually slows during the orgasm. Initial contractions Muscle son anal job with ejaculation at an average interval of 0.
Contractions of most men proceed at regular rhythmic intervals for the duration of the orgasm. Many men also experience additional irregular contractions at the conclusion of the orgasm. Ejaculation usually begins during the first or second contraction of orgasm.
After this peak, the magnitude of semen the penis emits diminishes as the contractions begin to lessen in intensity. The muscle contractions of the orgasm can continue after ejaculation with no additional semen discharge occurring. A small sample study of seven men showed an average of 7 spurts of semen followed by an average of 10 more contractions with no semen expelled. This study also found a high correlation between number of spurts of semen and total ejaculate volume, i.
Alfred Kinsey measured the distance of ejaculation, in "some hundreds" of men. In three-quarters of men tested, ejaculate "is propelled with so little force that the liquid is not carried more than a minute distance beyond the tip of the penis.
Most men experience a refractory period immediately following an orgasm, during which time they are unable to achieve another erection, and a longer period again before they are capable of achieving another ejaculation. During this time a male feels a deep and often pleasurable sense of relaxation, usually felt in the groin and thighs.
The duration of the refractory period varies Muscle son anal job with ejaculation, even for a given individual. Age affects the recovery time, with younger men typically recovering faster than older men, though not universally so. A short recovery period may allow partners to continue sexual play relatively uninterrupted by ejaculation. Some men may experience their penis becoming hypersensitive to stimulation after ejaculation, which can make sexual stimulation unpleasant even while they may be sexually aroused.
There are men who are able to achieve multiple orgasms, with or without the typical sequence of ejaculation and refractory period. Some of those men report not noticing refractory periods, or are able to maintain erection by "sustaining sexual activity with a full erection until they passed their refractory time for orgasm when they proceeded to have a second or third orgasm".
The force and amount of semen that will be ejected during an ejaculation will vary widely between men and may contain between 0.
Adult semen volume is affected by the time that has passed since the previous ejaculation; larger semen volumes are seen Muscle son anal job with ejaculation greater durations of abstinence.
The duration of the stimulation leading up to the ejaculation can affect the volume. One of the possible underlying causes of low volume or complete lack of semen is ejaculatory duct obstruction. It is normal for the amount of semen to diminish with age.
The number of sperm in an ejaculation also varies widely, depending on many factors, including the time since the last ejaculation,  age, stress levels,  and testosterone.
Greater lengths of sexual stimulation immediately preceding ejaculation can result in higher concentrations of sperm. The first ejaculation in males often occurs about 12 months after the onset of pubertygenerally through masturbation or nocturnal emission wet dreams. This first semen volume is small.
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The typical ejaculation over the following three months produces less than 1 ml of semen. The semen produced during early puberty is also typically clear.
After ejaculation this early semen remains jellylike and, unlike semen from mature males, fails to liquefy. A summary of semen development is shown in Table 1. Most first ejaculations 90 percent lack sperm. As the male proceeds through puberty, the semen develops mature characteristics with increasing quantities of normal sperm.
Semen produced 12 to 14 months after the first ejaculation liquefies after a short period of time.
Within 24 months of the first ejaculation, the semen volume and the quantity and characteristics of the sperm match that of adult male semen. There is a central pattern generator in the spinal cordmade up of groups of spinal interneuronsthat is involved in the rhythmic response of ejaculation. This is known as the spinal generator for ejaculation. To map the neuronal activation of the brain during the ejaculatory response, researchers have studied Muscle son anal job with ejaculation expression of c-Fosa proto-oncogene expressed in neurons in response to stimulation by hormones and neurotransmitters.
Although uncommon, some men can achieve ejaculations during masturbation without any manual stimulation. Such men usually do it by tensing and flexing their abdominal and buttocks muscles along with vigorous fantasising. Others may do it by relaxing the area around the penis, which may result in harder erections especially when hyperaroused.
Perineum pressing results in an ejaculation which is purposefully held back by pressing on either the perineum or the urethra to force the seminal fluid to remain inside.
In such a scenario, the seminal fluid stays inside the body and goes to the bladder. Some people do this to avoid making a mess by keeping all the semen inside. For most men, no detrimental health effects have been determined from ejaculation itself or from frequent ejaculations, [ citation needed ] though sexual activity in general can have health or psychological consequences.
A small fraction of men have a disease called postorgasmic illness syndrome POISwhich causes severe muscle pain throughout the body and other symptoms immediately following ejaculation. The symptoms last for up to a week. It is not clear whether frequent ejaculation increases,  reduces  or has no effect  on the risk of prostate cancer. The US study involving "29, US men aged 46 to 81 years"  suggest that "high ejaculation frequency was related to decreased risk of total prostate cancer".
This group were one-third less likely to develop aggressive prostate cancer when compared with Muscle son anal job with ejaculation who ejaculated less than three times a week at this age. In mammals and birds, multiple ejaculation is commonplace. In stallionsejaculation is accompanied by a motion of the tail known as "tail flagging". The semen of male dogs is ejaculated in three separate fractions.
From Wikipedia, the free encyclopedia. This article is about Muscle son anal job with ejaculation ejaculation. For the female counterpart, see Female ejaculation. For other uses, see Ejaculation disambiguation.
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National Institutes of Health. Retrieved 30 July Harvard Medical School Prostate Knowledge. Retrieved 9 February Journal of the American Medical Association. Cancer Council Victoria website. Sperm Competition and the Evolution of Animal Mating systems. Retrieved 19 April Michael Conn 22 October Paradigms for the Study of Behavior. Watch Muscle Son Interracial With ejaculation - VIDEOSLATINOZ mobile porn XNXX video at hiqh quality, download XNXX Anal AssBig Ass Big Cock Muscle - VIDEOSLATINOZ Thumbnail Latin homo butthole job With goo flow - VIDEO.