I have no idea sometimes.
Nathan and I have a favourite 'lifestyle' shop in the city (i.e. a shop that sells candles and home wares and stuff like that). The owner is the most camp and flamboyant person I have ever met. A few weekends ago, he introduced us to his wife, who also works at the shop. Up until then, we had always assumed she was his fag hag.
And then earlier this week, I was having lunch in the tearoom and one of my colleague's new grad students joined us. He was also extremely flamboyant. And also married...to a woman. I am so confused. I think my gaydar is broken.