Riddle #4

I am a parasite on the body.
I bite clean through the skin and hang on.
Biting without fear, often I hang clear in the air
yet my victim welcomes me.
Somewhat male, I prefer to bite females
(although I’ve been known to bite the other kind too).
People have called me beautiful
even ornamental to see,
and my body flashes goldish or silvery
and my back a glittering beauty
as I hang swinging from my victim who loves me so much.