...that you have clean with your mouth. I don't see how this advice...

Sometimes sex is just sex; it’s what you do when you are married. Just like cleaning the toilet is what you do to keep your house clean…and I bet you don’t have this great desire or huge emotional connection to scrubbing the porcelain! You do it because it needs to be done and that’s the way it is with married sex… it does need to be done! It’s the glue that God gave us to bond us to one another. The bible is very clear that it is your responsibility as a spouse.

...is going to solve any problems for married couples whose sex lives are inactive or dead. I agree, I guess, with the basic point—sex in a LTR can't always be a mindblowinglyaweseomeoutofbodyexperience, and people need to have realistic expectations or they're gonna be disappointed, and disappointment can curdle into resentment, and resentment can be fatal—but do you really want to tell people fucking the spouse is a lot like scrubbing shit streaks out of a dirty toilet?

Via PZ Myers.