Aryan Futurism Blog on Aryan MANNERBUND which discusses the idea of MANNERBUND or fraternities which practiced (culturally and spiritually) forms of homosexuality. Just thought I'd link to it here for people's delectations.
Personally, I'm rather iffy about the references to Indo-European sources for "Celtic" myths pertaining to Ireland. Ireland was never a Celtic island and if there was a MANNERBUND in the course of Irish history then this would be an Irish MANNERBUND or possibly reflects unique development in the culture like at other points in world history.