Couples should leave no stone unturned in their sexual repertoire, always renewing the spontaneity and freshness of their relationship. The rule of thumb is that anything that enhances the love, excitement, and intimacy of a marriage, while not compromising its sanctity or modesty, is always a good thing. Seen from this perspective, the Kama Sutra — its explicit nature aside — can be a kosher book.
— Shmuley Boteach, Kosher Sex