guys do because the lips are a sexual organ and because of that biting or liking your lips turn them on just so as kissing does best answer i think it simply brings attention to your lips when you do ityou can bite lick or even run a finger or straw across your lips and it will have the same effectbest answerits an indication she has to restrain herselfest answer i think it simply brings attention to your lips when you do it you can bite lick or even run a finger or straw across your lips and it will have the same effect best answer its an indication she has to restrain herself