text: are you at risk for  stds or hiv by having just the head of the penis going in for 5 seconds and then its out?   you're at risk of stds, but not from hiv. hiv is mainly transmitted because during intercourse, the vaginal lining gets minute splits and cuts in it, and when the penis ejaculates, the mix of fluids is the cause of infection. however, with stds, it can just be contact and you have it