Sexually transmitted diseases (STDs)

Also known as: STD
Sexually transmitted diseases (STDs)—also referred to as sexually transmitted infections (STIs)—are those spread by sexual contact. They may also be spread from a pregnant woman to her fetus before or during delivery.

Exposure to an STD can occur anytime a person has sex or close contact that involves the genitals, the mouth, or the rectum with another person, but exposure is more likely if a person has many sex partners or does not use condoms. STDs can be prevented by not having sexual contact (abstinence).