I have always wondered about this custom among the Eskimos, which wouldn't be without precedent, but does seem to run counter to what we know about male sexual jealousy.But sexual jealousy might also be cultural - I think I remember reading where Eskimo/Innuit (what's the current acceptable phrase?) people would allow visiting men to have sex with their wives. There was a reason for it, a social reason, but I can't remember what it was now. I wonder if we have sexual jealously because we regarded women as chattels, historically speaking I mean.
As for the radical gays. So, what is the "radical gay agenda" I keep reading about?
A Google search did not reveal anything definitive: claims that it was a myth, claims that their society was matrilineal and this is how a woman got a visiting man she fancied (unlikely, I think), and so on.
I did find this which seems more likely to me.