Joined at the groin is a slang term for sexual intercourse. The term comes because during heterosexual vaginal sex, the man and the woman appear to be connected or joined at the groin area.
The term joined at the groin can also be used as an adjective to describe a couple who are sexually active.
When used as an adjective, the term joined at the groin usually refers to a couple experiencing new relationship energy and thus having a lot of sex. Alternatively, it may be used to describe an established couple who are well known for their sexual exploits.
While the origin of the term joined at the groin refers to vaginal heterosexual sex between a man and a woman, lesbians, gay men, and couples of other genders and sexual preferences can also be said to be joined at the groin.
