For those who love lipstick but have a hard time wearing it because they have more of a half-moon shaped lip than cupid's bow, a lipliner might actually work in your favor. My lip line is somewhere in between and because of it, I have to be fairly selective on the lip shades I wear. Reds and bright fuschia's were really difficult for me to pull of until I started using a lip liner. Just like an eyeliner, they allow you to create soft and sensual or sharp and structured definition for those like me who are little bit lacking. I really like Jouer Cosmetics Lip Definer because of the wearable shade options and they draw on so smooth!