You probably heard by now that he had sex with a man on a video:
http://www.dailymail.co.uk/news/article-3330633/Video-surfaces-showing-HIV-positive-Charlie-Sheen-performing-oral-sex-man-smoking-crack-cocaine.html
My guess is that this was not the first time.
Why does Charlie feel he has to share all this info with us? Oye Ve!