I don't think it's the fact that the women are intrinsically attractive, but rather the fact that they're consciously choosing the pose/makeup/lighting in order the emulate the design language of the adultFriendFinder-style ads. (It's not like the glamor-shot trend of the 80s was the result of some evolutionary genetic shift that made every woman temporarily look like that.) The fact that most of the copy could apply equally well to sex trafficking doesn't help much either.