Sex, or "the cookie" as Steve calls it in his book, is a major point of contention for many couples. If you don't think it's important to your man, Steve says you're wrong.

"It's critical," he says. "It's one of the three things that a man has to have. A man has to have love, support and the cookie. [If] anyone of those three things is missing in the relationship, he's going to go get it somewhere else."