You should buy him the book "She Comes First." Have a look at it and see if it gets at what you're after, and give it to him as a present. I believe it's possible to ask to have your needs met in a gentle, non-judgemental way. His endowment can't be helped, but if you really do love him, then being (gently) honest with him about the things that CAN be helped, like technique, will go a long way towards improving your sex life, and your intimacy with each other in general. As an added "bonus," if it doesn't work out eventually, at least you've given him some pointers!