Question: Why would you purposely put two males together? This I just don't really understand..
It could be possible that one is male and one is female, if so I hope your ready for babies, or possible egg bounding if the female is the 2 year old.
It also has been heard of that two males will 'lock'. I think this has been asked on this forum before too, and it's not completely unheard of, though I don't know the reasons why.
I would assume, if they were two males, that they would fight.