Doesn't look like anybody answered your questions here.. but if you want to house males and females together and NOT get babies.. fixing the boys is really your only choice.. I don't, nor will I, fix any of my males.. and I don't agree with fixing every boy that comes thru the door.. I believe that neutering should be saved for males with problems.. SMing, genetic problems, physical problems, etc. Just my opinion.. I have heard that the boys are pretty painful afterwards, and some are put on pain meds for a while..
Intact males can live together without problems if they are introduced young enough. I have a pair of unneutered boys that live together great.. Hope that helped!