Understanding Sperm, Semen, and Pre-Ejaculate Risks
Sperm are male reproductive cells produced in the testes, while semen is the fluid that carries sperm during ejaculation, composed of sperm and seminal fluid from the prostate and seminal vesicles. Pre-ejaculate, produced by bulbourethral glands, may contain sperm in some cases, posing a very low but possible risk of pregnancy. Semen's characteristics can indicate health status, and contraception methods like vasectomy can prevent sperm from being present in semen.