My husband and his addiction for oral sex?

My husband has an addiction for oral sex The problem with him is that he likes ot chew my clitorius and that hurts me a lot One time I used to encourage him saying " You know the antomy well and I used to encourage him But now things have become problematic now B=Now he chews myclitorius and it hurts me very much He now says he needs that Its quite painful How do I get this obsession for lcitorius from his mind? Some one please advice me Is there any Pschycitaric treatment for this ? Kusuma Kumari, Nellore