h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

Im married to a very beautiful woman. I met her while I was in High School. She was a freshmen, and I was a sophmore. Well, four and a half years later, we got married.(her idea, not that I was against it) Nine months later, she gave birth to a beautiful baby boy.
Now that the background is laid out here is the problem. She never wants to hug or kiss. Her answer when asked why, she's not into PDA(public displays of affection). She says that she is not into sex, that we only have it because I need it. And if anything goes wrong it is always my fault. It doesn't matter if I had nothing to do with it, or if it was a natural phenomena.
I don't know about the rest of the world, but that kind of puts a guy down. Any advice???