Perhaps I'm just parsing your words wrong, but it looks as if you're suggesting that most non-commercial sexual interactions have "in the least amount of time" as a major goal. I'm fairly sure that's far from the case.

(In case anyone else is confused by gjm's confusion, the words "in the least amount of time" in ChristianKl's comment used to come after "instead of focused on the enjoyment of both parties" rather than before.)