Check out the wedding songs on my site: It's Not Me, To Be Free, Our Garden, Home in Your Eyes, Your Beauty's In Christ. They're not all about deflecting responsibility, but some are. And see if you can find any metaphorical references to sex. 

Somehow, lots of people who get married stay married. Here are some songs about them: What does it matter? (25 years), Elwyn & Marilyn (50 years). Well, I've written more anniversary songs than this, but it seems these are the only ones I've recorded.