That's because gay clubs/bars have ended up chock full of straight women. People claim it's because it's "safer from all the gross men in other places", which may be partially true. But also I believe it's because gay clubs can just be nicer overall, plenty of interesting drinks like cocktails available rather than just beer, more variety in music, etc. I think they may disallow women because for the bi/pan men in the crowd - their behaviour changes when women are present, they get more aggressive, domineering, chest beating. I notice it all the time in queer but non-gay friends constantly.

Which always annoyed me because I've been to a few Soho "gay" bars since and they're just full of straight women/hen dos. Asked for a cocktail..."we don't do cocktails". How the fuck do you call yourself a gay bar anymore then!

I go to a regular meet and one of the places next door is a drag bar, whose entire purpose seems to be to host hen dos. Ugh.