Embarassing discovery: making full-on sex noises during masturbation feels really good. I don't get to full-on screams by myself, but letting myself let out little whimpers and moans is so freeing and goofy and oh god sexy.
Now I kind of want people to watch me masturbate. Maybe even have someone holding me, cuddled up against my back while my front gets all busy. The stuff I do to myself isn't just an efficient pressure release; it can be languid or animalistic or gleefully perverse, and contains as much drama and eros as any other sex act.