Once upon a time shortly after high school I was at a house party, helping cleaning up after most everybody had left. While doing dishes one of my high school crushes, a drop dead gorgeous Persian girl who I’d always admired from afar but never really spoke to, came up behind me, pulled me into an unoccupied bedroom and started making out with me. After a brief moment of surprise kissing, this was our conversation:
Her: do you want me to go to the car and get a condom?
Me: nope.
Her: … you want to have sex without a condom?
Me: nope.
Her: … are you a virgin?
Me: nope.
Her: you don’t want to have sex?
Me: that is correct.
We hung out and chatted for a bit, that was that. Something about it didn’t feel right, and it turns out my instincts were on point because she actually had a boyfriend she was mad at, and I’m happy I didn’t get myself entangled in their mess.
If 19 year old me could say nope to her, 37 year old me would have no problem saying “no thank you ma’am,” to Scarlet Johansson.
And clearly, women who will just sleep with a guy do exist. I’ve turned a few down in my day.
Human sexual behavior is not as simple as you describe, even if what you are saying is generally true.
Furthermore, appealing to our nature doesn’t mean much, since our brains and our cultures as so advanced, pretty much every natural instinct can be overwritten by acculturation. Suicide-bombers, celibate monks, and plenty of more mundane examples of all sorts override their instincts every day.