Coitus interruptus, also known as withdrawal, is a contraceptive method in which intercourse is interrupted before the man ejaculates, so that he can withdraw his penis from his partner’s vagina. In doing so, he prevents sperm from entering his partner’s uterus and thus prevents pregnancy. Coitus interuptus is one of the least effective contraceptive methods. However, it provides far greater protection from pregnancy than not using any contraception at all.

More on male reproductive system.

More on female reproductive system.

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