it's part of the job. You can politely turn bands away. It's all art though, so I wouldn't sweat it. People have the right to say whatever they want
but in a private biz like a studio you reserve the right to not allow them a forum to do so. Personally as long as money is involved I don't care what anyone sings as long as it's not illegal.
It's like death metal and Satan lyrics. When that stuff came out lots of studios were offended by that. I was in a band and we did all that stuff in 82-83. We were into venom and hellhammer etc.... We had to explain to one studio owner it was just music based on horror movies. Then he let us record.
I was like did you ever see the Exorcist? or a Stephen king movie? he was like I love Stephen king
I had to explain to him that's all we were doing was Stephen king type story lines with music behind it. Of course were sucked as storytellers unlike Stephen King but he got the picture. Maybe these guys just watched x-rated movies for recreation? It doesn't mean it's right but it's who they are. Right or wrong
It's all art. But you don't have to like it, and you reserve the right to pass on it. That's your privilege