-as of [6 OCTOBER 2024]–
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(a usual precursor to ‘ejaculation’ is the sexual arousal of the ‘male’, leading to the ‘erection’ of the ‘penis’, though not every ‘arousal’ nor ‘erection’ leads to ‘ejaculation’)
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(‘penile sexual stimulation’ during ‘vaginal’, ‘oral’, or ‘anal sexual intercourse’, or ‘manual stimulation’ (aka ‘masturbation’) may provide the necessary ‘stimulus’ for a man to achieve ‘orgasm’ and ‘ejaculation’)
(‘men’ typically reach ‘orgasm’ 5–10 minutes after the start of ‘penile-vaginal intercourse’, taking into account their desires and those of their partners)
(most men could achieve ‘orgasm’ sooner or delay it until later if they wished to do so)
(a prolonged stimulation either through ‘foreplay’ (‘kissing’, ‘petting’, and direct stimulation of erogenous zones before penetration during intercourse) or stroking (during masturbation) leads to a good amount of arousal and production of pre-ejaculatory fluid.
While the presence of sperm in pre-ejaculatory fluid is thought to be rare, sperm from an earlier ejaculation, still present in the urethra, may be picked up by pre-ejaculatory fluid.
In addition, infectious agents (including HIV) often can be present in pre-ejaculate.
Premature ejaculation is the phrase used 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 as a dry orgasm.
When a man has achieved a sufficient level of stimulation, ejaculation begins.
At that point, under the control of the sympathetic nervous system, semen containing sperm is produced (emission).
The semen is ejected through the urethra with rhythmic contractions.
These rhythmic contractions are part of the male orgasm.
They are generated by the bulbospongiosus muscle 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 occur at an average interval of 0.6 seconds with an increasing increment of 0.1 seconds per contraction.
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 begins during the first or second contraction of orgasm.
For most men the first spurt occurs during the second contraction.
The first or second spurt is typically the largest and can contain 40 percent or more of the total ejaculate volume.
After this peak the flow of each pulse diminishes.
When the flow ends, the muscle contractions of the orgasm continue with no additional semen discharge.
A small sample study of seven men showed an average of 7 spurts of semen (range between 5 and 10) followed by an average of 10 more contractions with no semen expelled (range between 5 and 23).
This study also found a high correlation between number of spurts of semen and total ejaculate volume, i.e., larger semen volumes resulted from additional pulses of semen rather than larger individual spurts.
Alfred Kinsey measured the distance of ejaculation, in “some hundred” of men.
In three-quarters of men, the semen exuded from the penis, “In other males the semen may be propelled from a matter of some inches to a foot or two, or even as far as five or six (rarely eight) feet”.
Masters and Johnson report ejaculation distance to be not greater than 30–60 cm.
Distance of ejaculation however, has nothing to do with sexual functioning, as during penetration of penis in vagina the distance of ejaculation plays no role.
(dribbling of semen from the penis is usually sufficient for impregnation)
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 considerably, even for a given individual.
Age affects the recovery time, with younger men typically recovering faster than older men, though not universally so.
However, some men are able to achieve sufficient sexual arousal immediately after ejaculation, and others may have refractory periods of less than 15 minutes.
A short recovery period may allow them to seamlessly continue sexual play from one ejaculation to sexual stimulation in preparation for the next.
However, other men are averse to stimulation during the early part of the refractory period.
(there are men who are able to achieve multiple orgasms, with or without the typical sequence of ejaculation and refractory period)
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(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 2nd or 3rd ‘orgasm’)
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