When a man is ready to ejaculate his body will undergo a series of events. He will see an increase in the size of the head of the penis, where the head may also change to a purplish color. His Cowper’s gland will secrete a “pre-cum” fluid, dribbling out of his urethra. His testes will move further in towards the body, and increase in size. As well, he may experience a sex flush, muscle tension, increase in heart rate and rising blood pressure.

Just before ejaculation he will feel contractions in his vas deferens, seminal vesicles, and the prostate, causing seminal fluid (ejaculate) to collect in a pool at the base of his penis. He will feel a “tickling” type sensation.

When ready to ejaculate, he will feel a “throbbing” around his urethra. Ejaculate will leave his penis at roughly the same rate of travel as a city bus, 28 miles per hour, but can reach speeds of 43 miles per hour depending how long since the last time he came. (It’s all fun and games until somebody loses an eye!!)

Once he has ejaculated, his scrotum and testes will return to normal their size. He will have a general feeling of relaxation and experience a refractory period (where a he is physically incapable of getting another erection). This period may be from a few minutes to much longer.