Hi, recently I had an unprotected encounter with a female. We tried to have sex but I was unable to maintain a strong erection to penetrate the vagina. The tip of the penis made contact with the front walls of the vagina, but when i tried to pentrate it would pop out. We then proceeded to grind for a couple of minutes. i noticed her vagina was wet and it did make contact with my penis. Am i at risk of being infected with HIV? Please help!

extremly unlikely.

no, you are not.