Dear Doctor,
I recently had oral sex with an unknown HIV status person. We agreed only on oral sex and mutual masturbation. Later, he convinced me that lay down and he wanted to just rub his penis on my anus which he did for quite a few minutes. But in doing so, his penis is pushing into my anus many times (but did not penetrate me totally), I feel it went in for about 5-10 centimeters the most each trust. What are my risk here? I am afraid that his precum can get into my anus and get me infected.