Here's the clues to a better sex life, ladies: be around more men. No, it's not that there's cheating going on, or that spontaneous gangbangs appear more often in your life. It's the unsexy term "sperm competition", a gladiatorial spectacle known since...no, it's that when men perceive they're one of many potential mates, they're more interested in having sex with you. Potential is the key here: the woman doesn't need to do anything, except happily enjoy more sex due to the neanderthal brain of her partner who wants to get in there before anyone else does.

Via.