Maybe I am the worst kind.
I had 2 roommates, and one of them is gay, who sleeps in the same room as me, But my gaydar must be really pure virgin that I did not even detect him. I was so busy in fatuation with a straight guy back then, to actually gaydar this gay closet roommate of mine.
Years later, when I was out with a gay friend, and we chatted about my uni years, and he told me that he knew a few from my uni. Later at my place, as he flipped through my photo album, he was surprised I knew this Patrick. Patrick? My roommate?
Hmmm.. Just to show us that we never know where gays pop up from.