How do I make my boyfriend feel sexy again?

We have been dating for almost two years, and last night he told me he didn't feel sexy anymore. He said part of it was because he has gained a little weight. I honestly think he is as sexy as the day I met him, even more so now. And so what I have put on a few pounds too. I told him that what I look at when we are making love are his and his lips, the look on his face, his strong arms, and his broad shoulder blades and that he is so sexy. But he says he doesn't feel sexy when it comes to sex. what to do?