I'm a little curious how they're trying to conclude about pre-historic women by surveying/testing modern women. I guess you could argue they controlled for social norms/values (e.g. western nations think of large penises as attractive) by getting a diverse sample, but still.
I'm not a scientist, but I think it's hard to really isolate how much of it is sociology and how much is psychology/evolution.
I do remember learning that human males have larger penises than chimps (?) because we wouldn't be able to inseminate women if it wasn't. So I would really see that as maybe a starting point (the females who found males with larger penises as attractive had a higher chance of getting impregnated, and both the female offsprings found males with larger penises as attractive and the male offsprings had larger penises).
But IDK. Regardless of what they find out, I think whatever natural attraction or unattraction there is for larger penises has been multiplied wayyyy more by social expectations and culture. It's sad to see so many young guys spend hundreds of dollars on supplements and gym memberships as well as girls trying to achieve the looks photoshoped models have (hell, some guys and girls photoshop their own pictures on Facebook).
We're all going to get old at 30-40 and look ugly. Most of us are going to get married and stop caring about our looks because we already secured a partner. And most of us are probably going to have less sex once we get kids. So eh, *shrug*
