The ear most homosexuals get pierce more often than not is the left ear, hence its reputation as the Gay ear. It, therefore, suffices to say that when someone who is a heterosexual is piercing their left ear, it simply means that they are getting their gay ear pierced.
Considering this, what does it mean to have one earring in your right ear?
A single earring in the right ear signifies being gay but you can have them in both ears.