Ponytails, buns, and braids are summery staples that—depending on how you wear them—can look girly, sophisticated or (on certain days) a little lazy. But there's also one simple trick for making them sexy, says hairstylist Guido. He demonstrated the technique backstage at J. Mendel's fall ready-to-wear show—and it couldn't be easier to do. After your hair is up, pull wisps of hair free from along the hairline and right above the ears. "Softening it around the ears is what make a look more desirable," says Guido. The next time you wear a ponytail, try adding a little sex appeal—it won't add any time to your routine.