Well, that's the thing. It's not up to either me or Google to decide if it's okay or not.
If nobody else owns it, someone could register mothertheresa.com or popejohnpaul.com and put XXX on it.
Looking around, I think the only option you might have is, if it's misleading enough that
it's returned as a result
with SafeSearch turned on; you could report the site using the form
here.
That's about all I can see as possible. Maybe there'll be somebody along with a better idea.
Good luck.