Intercrural sex

Intercrural sex, also known as femoral/interfemoral sex/intercourse, is a type of non-penetrative sex, where the penis is placed between the receiving partner's thighs (often with lubrication) and thrusts to create friction. Sometimes known as the "Princeton First-Year", the "Oxford Style", the "Oxford rub", or the "Ivy League rub", and is a form of same-gender frottage, or colloquially "frot". Obviously, this can be performed upon either a man or a woman by a man, and has been reported in gay communities. It was a common outlet for pederasty in ancient Greece, because anal sex was considered demeaning to the receiving partner. The Ancient Greek term for this practice was διαμηρίζειν diamērizein ("to do [something] between the thighs")

It has been subject to various historical sodomy laws and religious restrictions enacted mostly by Christianity, though also sex education and sexual experimentation of adolescents may feature intercrural sex in the interests of avoiding pregnancy or preserving virginity.

Shere Hite's 1976 and 1981 research on female sexuality found that some adult women reported being able to achieve orgasm via intercrural contact to stimulate the clitoris.

A variation of heterosexual intercrural sex is a practice known in Japan as sumata. In Zulu it is referred to as okusoma. It has a long history as an accepted practice for young people in southern Africa.