I want sex much more than my husband

I am 10 years younger than my husband. We have mind blowing sex but not enough of it. It usually lasts about 6 minutes and only 2 to 3 times a month... it is NOT enough. I'm afraid I'm going to start searching out of my marriage for intimacy if something doesn't change. We've talked about it but he says he just isn't as sexual as I am. I haven't gained weight, he's not having an affair, but he isn't interested in sex but once in a while. HELP! What can I do? I don't want to cheat but he's so afraid of being intimate (because when he is, I initiate sex and he turns me down and he feels bad). I've talked to him about needing intimacy (touching, kissing, holding) even more than sex but he doesn't separate the two... what can I do?