Ejaculation is the process by which semen is expelled from the male reproductive system, typically during sexual arousal or orgasm. This process involves the contraction of muscles in the reproductive tract, which helps propel sperm and seminal fluid through the urethra and out of the body. The primary purpose of ejaculation is to deliver sperm to the female reproductive system, potentially leading to fertilization of an egg. Ejaculation can occur during various activities, including sexual intercourse and masturbation, and is a normal part of male sexual function.