I wonder why no women were involved in the experiment. Will we not be sending women on the first mission to mars? Also, I would imagine that regular sexual activity would make for a more placid social environment.
(I'm sorry, I tried to stop myself, I really did.)
Their relationships are just as complex and their breakups just as fraught as heterosexuals.
But at least in context of not giving birth to martians and current biotech progress, that is the way I can think of.
But if you consider and want an system has stability population, maybe what you said is right.