I have been on several websites in reference to my concern, and the statistics are killing me. "Low risk" is not low enough. I engaged in receptive oral sex a few times, for about a minute or two each time, and I'm unsure as to whether or not pre-cum was present during any of the times. I do suffer from sensitive gums and gum bleeds sometimes, but I never have a lot of blood just sitting in my mouth or any big open sores, and I'm pretty sure they weren't bleeding during any of these times. I have been the insertive partner far more times in oral and in some instances I even ejaculated into the guys' mouth (3 guys in all). A few times I had anal with a condom always (I was always the top) and I'm pretty sure the condom never broke, but I never checked to make sure. I was trying to be cool, until recently when I got bad diarrhea for about two days and flu-like symptoms, What are my chances of infection if any of these guys are positive?