Ejaculation is the ejecting of semen from a
penis, and is usually followed by orgasm. It is usually the final stage and natural objective of sexual stimulation which is either from sex or masturbation.
Ejaculation can also occur during sleep, known as a nocturnal emission or wet
dream, where the male has no control over the spontaneous ejection of sperm from his unstimulated
penis.
A usual precursor to ejaculation is for a male to have an erection, which then allows the
penis to be stimulated.
When a man has undergone a sufficient amount of stimulation on his erection, ejaculation begins. Sperm is pumped out of the
penis with rhythmic contractions, each contraction spurting more and more sperm out. A typical ejaculation consists of 10-15 contractions.
During sex, John shuddered with pleasure as he reached
orgasm and his erect
penis convulsed as he spurted warm sperm inside his partner's slippery
vagina. His ejaculation lasted for a wonderful 30 seconds during which all he could do was gasp and groan.