Two male cockatiels mating, should I stop them?

Ok, So my boyfriend and I got two male cockatiels two months ago, and all was going well, until just a few days ago when we got another one, a male… who has started having his way with our two boys. They dont seem to be in much distress, but it’s hard to tell. He just starts squeeking. Should we separate them? I dont think they’re in love…