When a male wears an earring on his left ear, it is most likely nothing but a fashion choice. The wearing of a single earring is sometimes believed to be a coded message about sexuality, but in this case, it would be on the wrong ear, according to Next Magazine.
There are persistent rumors of a "gay code" by which homosexual men identified each other in America in the 1980s by wearing an earring on their right ear only. It is impossible to substantiate this rumor. Men of all sexualities have worn earrings as fashion throughout history. If a man chooses to wear an earring on his left ear only, it is most likely just because he likes the way it looks.