I know a guy who's apparently like you in one way. We knew each other a few days, and on a nice sunny afternoon I was getting to know him better by giving him a handjob - the first I'd given him (so far). We were sitting in my room, on my bed but looking out the window - my room looked out over the harbor in our small town. We were chatting and kissing and I was stroking .... and stroking .... and stroking ..... and lubricating .... and sucking on him a little .... and I was beginning to think he had a problem. It had never taken me that long to get a guy to cum for me.
I asked him if there was a problem? Was I doing something wrong?
He said no, he was just really enjoying himself, and could cum anytime I wanted. I gave him a playful love-slap and said "any time? how about now? My arm is getting tired...."
He lay back, said OK, grunted, and beautiful string of cum shot out, on my hand, my arm, his belly ..... We had fun cleaning up
It turns out that he has a penis that is a little insensitive to touch - he never loses his erection during sex, but can keep it up for a very long time .... It turns out he does not have a problem at all - when I'm with him, I have a sort of blessing....