Wearing symmetrical jewelry has been the norm for as long as anyone can remember. But in recent years it has become fashionable to wear just one earring or a nose stud. The problem with that is it sends out a message, and depending on where the single piece of jewelry is placed will decide what message it sends.
This message system has been in use for some time, but it is clear not everyone is aware of it. So to sum it up quickly, if you wear jewelry only on your right side, it signals that you are gay or at least express some sexual interest in your own gender. To wear jewelry on your left side signals that you are straight.
Before coming out of the closet was fashionable, gay people had devised a method of communication that was oblivious to people that were heterosexual. Besides single pieces of jewelry it also involved color coded accessories that indicated your sexual preferences. There are too may references to this to link to so just Google to find them.
So the bottom line is just be aware of how you dress. You do not need to look gay to say that you are.