How high are the chances that you can get hiv or other stds from giving a handjob?

Low risk, be safe: Most STDs are passed through direct contact with body fluids and/or mucous membranes (the moist parts of the body, like mouth or vagina). If there is no exposure to body fluids (including small breaks in the skin), and good handwashing, then risk is low. However, warts, herpes, parasites can still be a problem even with intact skin. As always, risk is not zero, but quite low overall.