I have two males and they are fine together.
Chester is a very submissive, small, neutered male
Clyde is a huge, agressive, unneutered male
For some reason, this works for them. They have never fought. Anytime their play gets out of hand, we let them know that we are in control and things are fine. They sleep together and play together all of the time.
I should read the rules
regarding signature limitations.