Rabbi Shmuley Boteach, best known for his first book, “Kosher Sex,” has attacked Madonna, calling her a “slut” and a “vulgarian.”

In an essay for the Web site SomethingJewish.Co.UK, the rabbi blasts the head of the Los Angeles-based Kabbalah Centre for using Madonna to tout the virtues of Jewish mysticism.

“Earth to Phillip Berg: Do us all a favor and dump Madonna as your principal spokesperson,” Boteach writes. “Sorry to be so crass, but Madonna is a slut. Yes, she may sing, and she may dance. But she is famous for being a slut. And no religion dare have a slut as its principal representative.”