Chicks dig a guy with a guitar—even if he’s not playing it, according to a study in the journal Psychology of Music. When a man with a guitar case asked for women’s numbers, 31% said yes; with no case, only 14% agreed; and with a gym bag, 9% did. Our advice: Carry your gym gear in a guitar case. Just kidding. But seriously, sign up for some lessons. And leave the gym bag at work if you’re going out afterward.