My man is uncut and while the head of his dick is extremely sensitive, I've seldom been able to make him cum while giving him a blow job unless he's helped me out by stroking himself. I dunno, maybe he's used to the speed and pressure of his own hand. He loves to be in my mouth and it gets him to the brink, but only twice in 2 1/2 yrs have I been able to make him cum this way without his help. With former (cut) partners, I never had any trouble getting them off orally. I figure that lovemaking is a team sport, so it's fine with me if he participates... just like I sometimes reach down and participate when he's between my legs.