Let me say most importantly that if you look at his writing credits you'll see he didn't pen that one.
Second to that - go look up the lyrics. It's about old guys hitting on young girls. It says nothing about "wrinkly weiners" at all. To say that's what the song is about is straight up ridiculous.
I really don't care about what he did or didn't do. My only point is that saying it's completely normal simply because he makes money is equally ridiculous. People make money doing weird things, still makes them weird.