penetrate (v.)
1520s, from Latin penetratus, past participle of penetrare “to put or get into, enter into,” related to penitus “within, inmost,” penus “innermost part of a temple, store of food,” penates “household gods.”
– Entymonline.com
Back in the 20th Century sex was basically defined as someone with a penis penetrating someone else. It’s worth noting that an earlier meaning could imply putting or taking within. They really couldn’t conceive of “penetration” any other way than something a penis-owner wanted that their partner submitted to (however enthusiastically.)
Point being that when we’re fucking I’m not the only one doing the penetrating, am I? When we’re fucking we’re fucking!
