If true, all it proves to me is that he's a healthy hetero male.
I do think it is interesting that in Clinton's case, it was his "personal" business. But, in Cain's case, it's a smear. Why?
Clinton was doing it while serving as President of the United States. And then he sent his wife out on the TV circuit to lie about it for him! There's a big difference in my mind between a little sexually-charged talk and getting a BJ in the Oval Office.
It's hard to know if sexual harrassment is real in a lot of cases. It's usually a he-said-she-said situation. Some chicks will also initiate or go along with sex talk until it's to their advantage ($$$) to get "offended". Amirite?