In all honesty, and I've always liked your posts, sublimeone, my brother got divorced over his wife's insistence on co-sleeping. It's a Mayim Bialik new-age endorsed Cali load of bunk, and I say that with kindness.
If it works for you, go for it. But it's likely a really bad practice. This isn't a lecture; this is a dissent from the practice.
Here's what I would say: "Hey kid, GTFO. Your mom and I want to have relations. If your Mom doesn't want to have relations, I'll explain why we got divorced at twenty."
It's really the only justification for divorce -- and people on the board know how conservative and anti-divorce I am -- that I'm totally cool with. That's why it's called the "marital bed," and not the "family one" for most. But if you're cool with it, rock on. I just don't see the justification, but this is the unorthodox thread, so boogie two.