sexual slang rear-entry sex position riding sex position reverse cowgirl A sex position in which a person with a vagina straddles a person with a penis facing their feet in a kneeling or squatting position. After either person has guided the penis into the vagina, the person on top can keep her torso upright, or they can lean forward or back to lie on the person on the bottom's chest or move sideways at will. reverse cowgirl position reverse-cowgirl cowgirl 68 Sex Slang Words You Should Know