I've been married 3 years now and after a kid, my wife (28 yrs) has lost her confidence in her body and hence abstains from sex. I've told her many times that I still find her sexy (and I really do) but she doesn't believe me. Any suggestions on how to proceed?

I was also contemplating suggesting to her to post on gwcurvy or something like that to prove to her that she's still sexy, but is that really a good idea? She most probably won't be up for it anyways.