Won't that be a nightmare! The planet of five sexes. Four poor creatures trying to get one to stop building walls and shutting them out. Just when that one is ready to take a chance, two of the others throw their upper appendages into the air and give up.
Back to square one for the others.
Nah, that wouldn't work. The soul mate thingy cycle would be broken, wouldn't it? Unless it adapts to include multiples if need be?
Dammit, H.G., where are you? Explain this to me!