Is there any harm to masturbation?

I know excessive masturbation causes skin irritations, and certain ways of masturbation can damage the penis, but I am talking explicitly about discharging semen.
It gets rid of some nutrients, but nothing too worrisome. The only concern is that it gets rid of the equivalent of like 1-2% of your RDA of zinc, but the RDA already assume men jerk off like once a day so if you jerk off more than once eat more zinc.

So, is there really any harm from masturbation?