People pointed out to Jesse Bering that his study in evolutionary psychology didn’t prove about rape what he was trying to test; so instead of admitting that it missed the mark, he whined about how ethics committees wouldn’t pass the kind of experiment that would prove it. So? It’s not ethical to design an experiment that doesn’t prove something and then say that it does. Skeptifem has a good discussion.
Even the most piss-poor studies with questionable conclusions are reported in the popular literature, repeated in magazines, and end up in Reader’s Digest and soak into the “popular wisdom,” where they taint attitudes towards women for generations.