Well, the first thing you can do is help him feel better about himself as a lover. Be passionate about him. Teach him what you like. Tell him how much he pleases you. Exaggerate a little, if you need to. It would also probably be helpful if you initiate sexual activity with him. Tell him how much you want him, that you think about him, and that you can't keep your hands off him. Besides saying it, do it. Get aggressive in the bedroom and out. Be playful. Grab his butt. Give him a kiss unexpectedly. Pretend you have the love life that you fantasize about, and you make it happen. The responsibility and the pleasure will be all yours if you start making him feel like an attractive man and a great lover.