I feel pressure behind the clamp

I hear people talk about when they clamp they feel an intense pressure building above the clamp. I on the other hand do not. I feel it under anywhere I clamp. Do I clamp too tightly? If I loosen it, it becomes harder to maintain an erection.

What are you doing while clamping? I always clamp to porn so I don’t need to worry about losing my erection. I do know a couple of guys that clamp without any stimulus which I find frankly remarkable. I know I couldn’t do it. :p