No, not intentionally. Actually, I've never heard the term "co-sleep" until now.

My son slept in his crib until he got old enough to try to crawl out, then I got him a toddler bed. He went to bed every night in his own bed ... and woke up every morning in my bed. Sometime during the night he always came and got in bed with me. When he got a little older it stopped, he wanted to be a "big boy".