Ejaculation is the process by which semen is expelled from the male reproductive system, typically during sexual arousal or orgasm. It involves the contraction of muscles in the reproductive tract, which propels sperm and seminal fluid through the urethra and out of the body. This process can be influenced by various physical and psychological factors, including stimulation, arousal, and emotional state. If you have specific questions or concerns about sexual health, it's best to consult a healthcare professional.