Pornagain Mark Driscoll, controversial preacher and pastor of the very successful Mars Hill Church, has written a great book on sex and the Christian entitled Porn Again Christian: A Frank Discussion on Pornography and Masturbation. You can actually read the book online or download a free PDF copy here.  As you might expect, such a subject is handled with both seriousness and humor – here's one of my favorite humorous remarks:

Question: My wife wants sex more than I do, what should I do?

Answer:
Don’t tell your buddies or they will mock you incessantly for the rest
of your life after staring at you blankly without blinking for about an
hour in total silence. Do have sex with your wife as often as she likes
and thank God.