Could it possibly be something as simple as him being ashamed for being a fast ejaculator and not knowing what to sensibly do about it? You really ought to buy the book "He Comes Next" and it wouldn't hurt to buy "She Comes First" too.
Well, is may be part of it. I think that's why he likes to focus on oral with me, because he does want to me be satisifed when we do it and I usually can't get there just through our IC. More book for the list...thanks