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.
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