George Clooney, Tom Cruise or Charlie Sheen would be my guess?
this is the article on drudge that gives clues about the women so maybe we figure out it out this way. The only celeb with a checkered past that I can think of is Lindsey Lohan.
http://www.thesun.co.uk/sol/homepage/showbiz/6737076/Superstar-Hollywood-womaniser-has-HIV.html