>>13956274It comes from our evolutionary lineage of sizing up and looking at other men's dicks. When we meet new people, our eyes immediately start checking out the person. Statistically, the order in which we look at things is:
>first, the crotch>second, the chest>third, the nape/collarbone>finally, the faceThis all happens unconsciously in the span of a few eye muscle reflexes. This information then gets filtered by our mesencephalon and then the unconscious part of our cerebellum.
You learn a lot by looking at someone's crotch, but this has the unfortunate side effect of us being unconsciously attracted to the sight of penises. Fortunately, this doesn't mean you're attracted to men, you're just attracted to the penis. So when you attach a penis onto a woman, this basically tricks your brain and makes you double-attracted to them.