Say what?

Evolutionary psychology is criticized a lot for making it too easy to generate hypotheses which are unfalsifiable. You observe a trait x, therefore trait x must be adaptive; here's a story explaining why it's adaptive. For the record, I definitely do not agree that evolutionary psychology is unscientific. It is. It is a subject that studies testable hypotheses. However, it is also being outrageously oversold in the popular media, which are chock-full of unfalsifiable evolutionary just-so stories. For example, Christopher Ryan, author of Sex at Dawn, writes this:

Not only does one sperm compete against millions of your own, but millions of other men. Considering women’s immune system treats sperm as invaders, women select their mates on a cellular level regardless of what their instincts might tell them. (...) not only are women naturally promiscuous, but men are attracted to other men having sex with women (...) This is why women scream during sex--to attract more men to join the fight.

Color me unconvinced.