Every animal that lives in the ocean pees in the ocean. Why shouldn't we?
People pee in public regularly, particularly drunks.
Public urination bylaws aren't enforced, except in Singapore.
Even in Singapore, people pee not only in the ocean, but also in the swimming pools.
I'm in favor of banning urination in pools, but enforcement is currently impossible, unless someone invents a reactive dye.
I have read that there is a reactive dye. It turns green in the presence of urine.