Oral Sex

I don't think my husband likes giving me oral sex. He claims that It's not that he doesn't like it, it's just that I'm the only woman he's ever done it to and he's worried he isn't doing it right. I've assured him that he is but I still have to ask for it, the only time he ever does it on his own valition is when he's drunk. A lot of times I have to ask for any kind of foreplay at all, he usually just wants to go straight to intercouse and I just can't do that. I don't know what to do because I really enjoy oral sex and a lot of that enjoyment comes from knowing the guy enjoys it as well. Sometimes I even notice that when he does do it, he somewhat losses his erection afterward. I don't know what to do because it really makes me feel bad about myself, like he doesn't like doing sexual things other than just intercouse with me.