I have talked with 2 different people in our area that have multiple pyr and both have multiple males (in tact, even) and have no problems. One gentleman I talked to has 4 male Pyrs, all in tact, and they get along fine. I have heard what you have heard....that it can be a real problem, but the only 2 people I've talked to with experience, say no problem. Good luck. Kris