I have been reading the book "Marriage Markets" by Cahn and Carbone. The book made me realize that there two different models of how much sex women will want to have.

Model 1 (RP?): When there are more women than men in a dating market, women will have less sex, because there will be fewer alphas available to them.

Model 2 (BP?): When there are more women than men in a dating market, men will have a stronger negotiating position in relationships. Men will use this to "negotiate" more sex, which isn't women's favorite thing actually.

How to decide between these models? The book cites a study about colleges where the gender ratio ranges from 70% women to 30% women.

It turns out that in the colleges with more women than men (which I will call "men's paradise"), women with boyfriends are less likely to be virgins and more likely to have frequent sex. They also have a more negative view of men. In the colleges with more men ("women's paradise"), it's the opposite: women with boyfriends are more likely to be virgins, and women have a more positive view of men. This seems to support model 2 (BP?): women don't really want a lot of sex, they "settle" for it when they don't think they can find a man who will commit to a low-sex relationship.

(It's especially telling that not only do women have less sex in the "women's paradise" schools, but their view of men is more positive. Why would women have less sex if their view of men were more positive, unless sex wasn't their favorite thing?)

How to explain the observation that in real life, women often spurn LTRs in favor of casual sex? The answer, in model 2 (BP?), must be that it is difficult for a guy to send a credible signal that he will be faithful. Choosing between an alpha player and a beta guy who claims he will be faithful but is probably a player anyway (a "nice guy TM"), women will choose the alpha every time. In men's paradise, all the men are likely to be players and the women can't trust them with an LTR. (It sucks for those men in "men's paradise" who actually aren't players though. For them it isn't paradise at all.)

What do you think? Am I right in saying that the first model is RP and the second is BP? Which model do you think is more accurate?