✔ 最佳答案
it only has to do with how often you do it
see every time you get an erection the veins, arteries, and capillaries on your penis dilate( stretch in other words) and get filled with blood, after you lose you erection all that blood leaves the penis but the veins and all that still stretch and need time to go back to their normal size, but if you get another erection before they go back to their normal size you are kinda overstretching them and that can cause some pain afterward
just try to do it less often and then pain should soon go away