From all I've read sex is a mental thing. I'd try dressing sexy, acting sexy, hinting at it, flirting and see if that gets him thinking about it. I might also ask him what he finds sexy. What is the sexiest thing he can think of? While you're asking him these questions wear a low cut top (or tight sweater... whatever you think he likes...). You may have to entice him, but try not to make it too obvious. Whatever you think he likes or whatever he tells you he likes... try to do that. Also, do things that make you feel sexy as well. When you are gushing with sexuality he may find it difficult to resist you.
One more thing. I think any woman can be sexy. You don't have to have the perfect body or be beautiful. Sexy is an attitude.
There is no arriving, ever. It is all a continual becoming.
