Inter-crural intercourse (from "inter-" and Latin "crura", legs) is a type of "outercourse" which involves placing the penis of one partner between the other partner's thighs, either from the front or rear, and thrusting to create sexual pleasure. A similar effect can be achieved by inserting the penis in the armpit.
It is often practised by couples who have chosen not to have vaginal or anal intercourse, which may be due to fear of pregnancy or STDs, or a distaste for penetration. This form of sexuality is not completely safe, as it still carries some risk of STD transmission and a remote chance of pregnancy.
Intercrural intercourse is frequently seen on ancient Greek ceramics depicting pederastic sexual scenes; the more common genital groping pose may be a sort of foreplay specific to intercrural intercourse, lifting the testicles so that the penis may better enter the area between the thighs. It is also known colloquially as the "Oxford style", as opposed to the "Princeton rub" (penis-to-penis frottage). These names refer to homosexual practices supposedly characteristic of the university they are named after.
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