I read the psychology today article, very interesting stuff. I had read about how women (and men to some degree) actually prefer the physical scent of a partner that has a strongly compatiable immune system to their own, but I had never heard anything about sexual satisfaction based on latent genetic profiling. I wouldn't say their findings apply across the board (a guy could have perfect symmetry, but if he doesn't bother to ever shower and really, really sucks in bed, he's still not going to be a straight ticket to female orgasms - there are a lot of external factors that marginalize this stuff to a great extent in modern society), but that's as good of an evolutionary explanation as I've heard. I wonder though, there is a percentage of women that are almost always orgasmic and even multi-orgasmic with just about any partner, how would the study account for this segment of the population? I think in the end, female recognition of strong genetic traits facilitates orgasm but certainly doesn't create it.
I agree with 10inch about the "larger men have more sex" thing. That survey is not legitimate in any way, shape, or form. It's more likely a bunch of fifteen year olds having a laugh after school by filling out the old dick survey. Nothing based on online reportage is going to be reliable. I understand the notion of bigger guys being more confident, but all you need to do is browse these forums for a little while to see a multitude of well-endowed guys that lack confidence. And, as the other study suggests, it's more likely that the important factors in getting laid are other traits.