We are the same - yet Different

Three bodies, sometimes four, but we hold one head

If you know me, you'll see I am not she, he or she

you see us as the same, to know the difference you must be sane

She started it as a joke, then one began to poke, the other a flirt

now we are scorned by the same folks

I am not her and she is not he but we are we

Confusing you I see? 

Sorry, but I am not volunteer friendly