Sexually transmitted diseases (STD) or sexually transmitted infections (STI), are illnesses that have a significant probability of transmission between humans by means of sexual behavior, including vaginal intercourse, anal sex, oral sex etc.
STDs have been well known for hundreds of years, and venereology is the branch of medicine that studies these diseases. While in the past, these illnesses have mostly been referred to as STDs or VD, in recent years the term sexually transmitted infections (STIs) has been preferred, as it has a broader range of meaning; a person may be infected, and may potentially infect others, without having a disease.
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