The common use of sexual activity in a heterosexual relationship. The male penis is inserted into the female vagina and good times are had. Not to be confused with penis-anus-sex.
I'm sorry to cut our conversation short but my wife and myself are going upstairs for some penis-vagina-sex. I'll talk more of my business proposal in the morning.
by Jack Diddly Squat December 07, 2003

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