It baffles me that even after all the info on the internet and threads on this forum, people still ask this question. I think I've answered 4 or 5 people about it. Though granted, it's usually in regard to housing multiple species.

In a nutshell, unless they're both of breeding age and you WANT babies, don't put them together. Garters and corns are the only semi-social snakes I know of, and even then it's best to separate.