I wouldn’t know as circumcision at birth has meant I never had much sensitivity. It takes a lot of stimulation to get me off - and honestly it’s almost always more mental stimulation than physical. It’s not entirely unusual that I don’t “finish” if I’m not so mentally into it, or just plain run out of energy. I guess I’m glad I can last a long time for my partner’s benefit, but it can be frustrating. My spouse gets the emotional reinforcement when I do finish quickly, however, since it indicates just how excited I am.