@RealDianeYap This is obviously not what she meant. What she meant is, "I can't stand the thought of only being with you physically. I love all of you." But if he was already insecure about his looks, it may feel to him like she was settling for him because he fulfilled other roles.
@RealDianeYap Okay, so I think I understand both sides, and the difference in opinion comes from availability. For most woman, sex isn't really a reward. For men it oftentimes is treated as one. So men hear this as "I would reward others for free, but you have to work for that reward."
@butchbishonen The idea is that a hookup is chosen solely on physical desirability whereas a relationship is more a balance of factors. So it's like saying "I wouldn't pick you based just on your looks." It doesn't mean you think that person is ugly, but they aren't turning heads either.