Fortunately, IIRC, the authority for the proposition that Vinga is a lesbian (or that her followers are, or whatever) is an email from Greg to a list talking about a publication that talks about one particular set of Vingans. Emails from Greg are as stable and permanent a foundation for Glorantha as a double-wide in a tornado.* I'm not taking that to overrule Storm Tribe, say, where such sexual preference is not noted, or King of Sartar, in which various authors with axes to grind against Kallyr never mention it (and, in fact, seems to imply that she -- the good queen -- married a man at some point).
I could buy a statistical argument that lesbians are more likely to find an outlet in the Vinga cult than in many others, but the causality then runs from lesbian tendencies to Vingan membership, not the other way around.
Chris
- A double-wide is a luxurious form of accommodation made available by upright, industrious Americans for those who will achieve the American dream sometime later in life. You ignerint furriners might also know them as mobile homes.