“IT'S CALLED GOSSIP AND OF COURSE IT'S AN OBSESSION OF MINE -ANDY WARHOL

According to research conducted by Nick Rule and Nalini Ambady, it takes just  50ms (that's milliseconds) to determine a man's sexual orientation. Twenty-two male and sixty-eight female undergrads were shown photos of 90 men's faces (half were homosexual) for 33ms, 50ms, 6500ms or 10,000ms and were asked to guess whether or not they were gay.
It was at the 50ms timeframe -- long enough for the faces to be consciously seen -- that the students' could accurately deduce sexuality in 57 per cent of the cases. Accuracy didn't improve when subjects viewed images for longer periods of time.

-Banana Guide