TONS of people will keep their corns together, male male female female etc, and NEVER have a problem, but there is ALWAYS going to be that exception. Corns are colourbrids and CAN become Cannibals, though it doesn't necessarily happen in ever situation where they are cohabbing it does occur, (more frequently in hatchlings) some other issues you may find with co-habbing are your snakes might become stressed out, and it is harder to monitor them, (regurge etc.) All in all, you may be able to successfully keep 2 in the same tank, and MANY people do, however there is always that exception that seems to get people riled up.