How can I become more physically attracted to my boyfriend?

Hello, I’m a new user from AnswerBag and I have a dilemma. I love my boyfriend but I just don’t find him all that attractive. I always tell myself looks aren’t important and I love him for him and that familiarity will continue to make him more attractive to me. But it is just not setting in, we’ve been together 5 months. I feel like something is missing in the relationship. My female friends who are in love with their boyfriends always say they don’t even look at other guys because they don’t seek anything else. But I find myself lusting after other guys or wishing my boyfriend looked more like x or something was different about his appearance. I know it is terrible but I cant help it. Any advice?