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This act normally occurs during heterosexual intercourse performed in the "reverse cowgirl" position, but can occur in the midst of other positions. While the man's penis is inside the woman and she moves too far one way (typically towards the man's feet), causing an outstretched, uncomfortable sensation for the man.
Mike 2: Me Julie was riding me reverse cowgirl last night and gave my dick a serious case of cuntorsion the way she was movin.

Mike 1: Weird, that never seems to happen to me...
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