Because, you see, according to Driscoll, lots of sex makes a good marriage in the mind of a husband. Sex is the center of a good marriage, hence the use of my clumsy, made-up, mock Latin word "sexocentric". Because it is Sexocentric marriages that Mark promotes in his book.
He says on page 164 that: "For a wife, sex comes out of a healthy relationship, whereas, for a husband it leads to one."
What, you say? Did I actually read the book to find this quote? No, I absolutely did not. I left that for the experts Wenatchee the Hatchet (WTH) and Wendy and Andy Alsup who, as former members of Driscoll's church, have kept and eye on him.
The Alsups state in their review on Mark's Sexocentric Marriage book that if for some reason Grace would become incapable of providing Mark with all the sex he needed or wanted or be incapable of any sex at all, "If that became the case, the majority of their marriage book would be useless to them."
I say all this for a reason.
I want to direct your attention to WTH's article discussing this in a bit more detail with the added information concerning Pastor Bill Clem who resigned from Mars Hill in 2013 and who also preached to single men on how to be able to love their (future) wives in non-sexual ways.