When a man has an orgasm and semen comes out the end of his penis. Ejaculation consists of two phases (emission and expulsion) and it is greatly aided by the consumption of porn. In case you think that ejaculation is an event solely produced by the penis, hurling a wad of semen requires the involvement and coordination of the distal epididymis, the vas deferens, the seminal vesicles, the prostate gland, the prostatic urethra, the neck of the bladder, and a major jolt to the crotch by the autonomic nervous system. You’ll forever read about the fact that men can have an ejaculation without having an orgasm, but good luck finding guys for whom ejaculations without orgams is a regular occurrence. See semen.