concerns on pumping

I heard pumping will lose the hardness of the penus. is it true?

can’t find it in the pumper’s section

If you pump up to high levels of pressure for extended periods of time you can get considerable fluid buildup. This causes the loss of hardness by adding a layer of sponginess and also the damage you do will cause your erections to weaken.

Sticking to lower pressure pumping doesn’t eliminate the fluid buildup, but at least (for most) you can get much harder erections from doing it, due to the vascular benefits of pumping. Combine this with manual exercises and you’re gaining, while improving your erections.

A good rule of thumb is, if your erections are weak (when they started out strong), you’re doing something wrong.