knee sex
knee sex is when while making out with a guy(laying down), he carefully rubs his knee against a girl's crotch to stimulate her vagina and get it ready for fingering and/or sex.
girl 1: I wasn't going to go past 2nd base with him, but he started doing something with his knee and i went crazy.
girl 2: O he did the knee sex move. yea he does that well.
girl 2: O he did the knee sex move. yea he does that well.
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