hi, yesterday i scratch my scrotum, no blood,just feel bit pain when i wash it using soap..then after 6 hours, i do erotic massage and getting hand job using plenty vaseline...what make me worried, we she doing hand job on me, her vagina touch my scrotum (not the scratched part) for 10 seconds at max,,,is it possible to get any std??considering her vagina is not really wet+my penis are covered with pleanty vaseline, which may act as another barrier??