The answer to this question depends on how logical you'd like your life to be.
Two men are two men. And communication is what two men should do with one another. (Among other things.) Men and men are not men and women.
Men and women sign up for marriage, and there's tremendous pressure to behave in ways defined by tradition, religion, and culture, and sometimes this all works for them.
As gay men, well, we don't have any role models at all for this sort of thing. Or do we? Ironic, to find ourselves comparing our gay relationships against the Judeo-Christian prototype of relationships as taught to us by Mom and Dad, and then labelling ourselves sluts and whores when we fail at it.
Men should be pairing off according to friendship, according to bonds they have shared, and according to the places they'd like to go together as men in their mutual love for one another. Not for co-dependency, not for kids, not for a house, and not because they want to play Marcia Brady cheating games on their companion.
Men should set boundaries, communicate, and then honor their word. Nothing more, nothing less.