Not an offense where there is mandatory registration. But indecent exposure does carry a lifetime registration requirement. There is a fine line so have your friend be careful.
The above information does not establish an attorney client relationship nor is it meant to provide legal advice.
Is he being charged with indecent exposure or urinating in public. The prosecutor could charge him with indecent exposure even I he was arrested for public urination.
It's always better to have an attorney than not.