So, I'm lazy, and I didn't read all the replies, so sorry if I'm repeating what someone already said.
I think guys don't realize that we need constant reassurance. Like, maybe they feel that if they told us two months ago that our ass is fine, then we shouldn't need to hear it again. Sorry, guys, that is definitely not the case.
Keep telling us about our perfect ass and face and body and personality (you like how I put that last?).
I have a little self-esteem problems, but the weekly comments about my sexiness definitely make me feel better. I don't base my WHOLE self-image on what my boyfriend thinks of me, but it is a factor. If I think he doesn't find me sexy, then I feel like shit. Cause I want to please him. And one way for him to indicate that in a way that i will definitely get is to give verbal compliments.