Since the lining of the anus is very thin and can tear easily, it is much easier for a person to be exposed to a sexually transmitted disease during anal sex, if one partner is infected. Also, when a guy inserts his penis into a female partner’s anus, and he ejaculates, the semen can drip into the vaginal opening, increasing her risk of becoming pregnant.

For these reasons, it is very important to ALWAYS use a lubricated latex or polyurethane condom for anal intercourse. A penis or object should NEVER be inserted into the vagina after it has been inside the anus, without washing the penis or object first. Rectal bacteria can be very harmful if it gets inside the vagina.