How safe is a penis pump?

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As long as there are no medical conditions, other than the ED, they are pretty safe. Like most things, listen to your body and stop and release the pressure if pain is felt. Above all else, do not over do it. Only pump enough to get the erection, two or three pumps, once you have a good seal, would be a good place to start. Usually problems come from over pumping as this can cause ruptured blood vessels.

As far as you doing it to him, as long as there is an open line of communication between you both you should be fine.