Why couldn't they be gay communists? Karl Marx was part of the Paris scene for a long time after all...the free love movement, expatriates from Britain and the US, artists in funny hats, communists, anarchists, women who had the idea they might be as good as men...a very odd place to be at that time. Kind of like a folk festival, actually. ;-)
Okay, I know, the Musketeers were from a different period in time. Still though....