I wouldnt do it.

Its not a good idea, they will stress eachother out and may get sick and go off feed. People think that just becuase they do it, or have done it in the past that its okay....its not. People also tend to think that since the snakes curl up together that they must "love eachother" or be "friends"...thats wrong too. Snakes dont curl up with eachother becuase they are buddies, the do this becuase they are competing for the warmth in the tank and i have also heard that one snake can become more dominant and harm the other.