Hmm. I seem to have argued myself around to the 'any two genderfucked guys' situation I was denying at the start of the story, and I suspect that my own tendency to friendly promiscuity is colouring my reading rather a lot... I think my points stand though. It's not so much 'any two guys' as 'any two guys given this extremely specific context' and the prior relationship between them is still relevant – the community/identity aspect doesn't outweigh absolutely everything else, but that doesn't mean it isn't important. :)