You know pheromones? Those elusive sorta smells that cosmetics companies are always trying to bottle and sell to help us find romance through beauty products? Turns out they're the very thing that make girls have sex, well, like girls. It's pheromones, researchers have just discovered, that suppress male sexual behaviors in females. (Or at least that's what happened with a bunch of mice โ€” who started humping like it was nobody's business when their pheromones were suppressed.) Conclusion? That deep down, we chicks are nasty knee-humpers too. [MSNBC]