Hi, I had an experience with another guy where I kept my pants on and engaged in dry humping his bare buttocks/anus. My genitals were completely covered but my hands did touch his bare back and the cheeks of his bare buttocks. Also, after grinding I did masturbate myself, so not sure if my genitals touched my pants after they were exposed to his anus or if my hands could have transferred anything to my penis after touching his skin. I am very nervous about HPV and Herpes from this. Am I at risk? Please help.