Before I knew anything about rabbits, I bought two male litter mates thinking they were bonded because they were in the same cage at the pet store. I was wrong. A week after I got them, they started to fight. I separated them, had them neutered, and tried to bond them. I gave up after the first try because they started fighting right away and it was pretty violent. Other people might have different experiences, but I personally would never put two male rabbits together again unless they were adults who had been previously neutered and acted at least somewhat friendly on their first meeting. They may get along as babies, but once they start to reach sexual maturity, that all goes away.