This is fun, and I think we can all smile at most of the answers people are posting.
But to be serious for just a brief moment, there’s a lot about prehistoric sex practices we can’t be sure of and may never know. Archaelogical clues are scatered. Speculation based on what we’ve learned from studying current and historical indigenous groups might be as close as we can come. And that evidence shows plenty of diversity when it comes to sexuality.
I guess my point is: If we think that the rules & norms we have for sex now are the result of something that’s evolved in a straight line from our distant past, it’s just not so.
We’re a bunch of curious and sometimes strange creautures still trying to figure out what’s hawt, and what’s not.