Humans, too, hard-wired leverage sex

There's a really interesting Scientific Blogging article on how no matter how wealthy young subjects of the study were (college students aged 18-27), the men and women both attempted to trade "sex" (term undefined but I believe it was broad, meaning any sexual act) for resources. Even those not lacking for resources tended to negotate these "nuptual currencies," and these findings are a preliminary suggestion that just as in hummingbirds, penguins, elk, trade sex for investment or access or protection, humans are hard-wired to do the same. Study was by Daniel Kruger at University of Michigan School of Public Health.