Re: Tell you what then,
"I think your case study design may carry a risk of selection bias.."
Probably because, like people of varying sexuality, you don't really know who or what they are in day to day life unless they are "in your face" about themselves so it's "militants" that most people are aware of.
(yeah, I know, not a great analogy since most LGBT are not choosing a "ifestyle")
A guy I worked with for years, never knew he was gay until recently, but then he doesn't dress up like one of The Village People or talk like Julian Clary. I never knew, didn't care and still don't care. He's just a bloke.