"The lip bite brings out his inner caveman. Why? It causes blood to rush to your lips, which plumps and reddens your pout. Both are signs of fertility, and when a guy sees them, it sets off his primitive instincts. […] The gesture also suggests that you’re struggling to figure something out, which sparks his curiosity."

Cosmopolitan on “Guys Decoded: Why He Loves When You Bite Your Lip,” as it continues to demean men and consistently refers to them as “caveman” and “animalistic” and reinforces the idea that women should merely exist to give men an ego boost (p. 88, March 2012). Other ways to bring out your man’s “primitive” side include spearing and skinning an elephant and chomping raw meat. Let’s not forget to mention the implication that when you look like you’re “struggling to figure something out,” men find it irresistible, because there’s nothing sexier than women who play dumb!