I can't imagine the issue coming up; if I am not sexually attractive, why do you want to have sex with me? I cannot imagine anyone who cares for me telling me such a thing, it's a selfish thing to say as it is telling another about yourself, what attracts or does not attract you, but to the person you are telling's detriment rather than pleasure.

If I love or care about you, I want good things for you and am going to tell you about myself to help you understand me so we can get along better, not to make you feel inadequate and boost myself. If I am with you and do not find you attractive, I have a problem and want to decide what to do about it with the least amount of hurt to you as possible.