His Pro (I can't remember her name) complained that it had explicit lyrics and totally went against his image. I wouldn't be surprised if the celebs had something in their contract that states they can refuse a song or a dance move if it's deemed inappropriate. We know that duck girl had big daddy there watching everything she did to make sure it was 'clean'.
I see. I didn't know who he was before DWTS. Looked him up and saw he was in his 20's - didn't know the song either.