I think you misunderstand the definition of "penis". Look the word up on dictionary.com. It would be VERY unusual to have more than one penis. Perhaps you are confusing "penis" with "orgasm". If so, then the answer is there is no fixed number of orgasms beyond which it becomes harmful.
Fasting without food for more than 3 days can be harmful to your health.
7
Just one
one time a guy had surgery to have two penises, but only won worked
46
14 which includes their penises
4 billion and 7 penises
3 penises
Five.
Uh, once.
On January the first there was a total of 4,359,386 dicks in he world.
they have many giant penises on their house's walls.