Don't pat him on the back more than 3 times - The Man Hug
That's right. Some semi-smart PHD types with nothing better to do have published results of a study about the Man Hug. Different types, variations on a theme, when it's appropriate. I'm not sure which is more gay.. someone actually studying the man-hug or manties (ruffly panties for men - link found via Mr. Roboto).