this isn't a real risk for std's. no reason for testing from it.
we recommend that if you are going to be naked and having sexual contact that a condom be worn. It saves you worrying as well as protects you in case things progress to something besides manual stimulation.
grace
From what I've been told, there is no risk. I know they tell us Herpes can be transmitted through skin to skin contact or bodily fluids but apparently handjobs (or mutual masturbation) aren't considered a risk. I don't know why because it kinda sounds contradictory but ...