When a guy puts his finger(s) inside a girl's vagina and slides it up and down, thinking the girl enjoys it, when in reality it often hurts, and you should just let the girl hump you. It will save you the effort and make her cum a lot faster.
Man: "oh baby you are so hot...*insert fingers*
female: "Ouch, fingering hurts me. I'll show you what I really like" *Climbs on top and grinds vagina into dick*