> given the complaints of women in male dominated organizations, any group that is male only comes across as suspect
Believe me, any male dominated groups I've been in were not male only by design. You simply live in tech or geek culture and try to arrange meetups, and you will end up 80+% male. I wager in terms of "individuals" it's more like 70%, but many women who show up come with an SO so that pushes the statistic higher.
I dunno if this is some odd Gen X/Boomer divide, but I can't recall a purposefully male oriented space. Ironically enough, the first that comes to mind is... single father gatherings. The one example given in the article is church, and IME churches were slightly skewed female (note, I come from a black background so that may affect experiences).