That sex verbs are always transitive in the guy-subject, girl-object direction? Eg, "I penetrated her." As opposed to, say, "I enveloped him." It's always, "Yo, I was screwing her all night. I mean I really pounded the shit out of her." As opposed to locker room talk in the girl's bathroom: "Yo, I was engulfing that prick all night. I mean I really wrapped the shit out of him."