Lots of good advice here!
I'll add that part of him learning what gets you off also means that he'll have to learn what DOESN'T get you off. I've run into guys who have a rough time wrapping their heads around the idea that their fantastic and manly cocks actually--gasp!--can't make a woman orgasm. Dudes are raised in this culture to believe that their cocks are the be-all and end-all of female pleasure, so it can take some work to convince them otherwise without hurting feelings. This may not describe your guy at all, but I'm throwing this out there just in case.
Like Owl Identified said, lying to him and telling him you do get off on PIV sex will only make it more difficult to communicate what you like later, especially if he believes the magical cock myth.