There is a difference between what people are doing with their spouses/girlfriends/boyfriends/other consenting adults and what people are doing that happens to cross the line. Unsolicited photos of your stuff to a reporter is kind of over the line.
Of the things you mentioned, did MLB do anything about Grady? PGA with Tiger? How about Oden and the NBA? No, because it was stupid stuff that wasn't really anyone else's business. But when a player starts to look like a predator, yeah, they're gonna get involved.