I saw an advertisement for a program put on by the history channel a while ago, it showed a clip of the actor playing Benjamin Franklin, and he referred to Franklin as a womanizer. I have read extensively about Franklin and have found no such evidence to suggest he was a womanizer, although if I am not mistaken the following statements are true: he had relations with prostitutes in his early twenties before marriage which led to the birth of his first son, he was only in a common law marriage with his wife Deborah, and he carried on a private correspondence with a young girl, perhaps distant cousin(?), though the letters suggested his intense affections for her were due to her hinted-at virginity and rejection of Franklin's advances. In this case, I am referencing this definition from vocabulary.com: a womanizer "...is a man who always seems to have a new girlfriend, and who has no hesitation about starting up a new relationship before he's ended the last one. Usually, these relationships are sexual and don't last long." I can't seem to find anything, but it appears to me to be a commonly held belief. Thanks for any contributions!
Well, to add to your examples above, there's the episode in his Autobiography where he's sharing lodgings with a couple. They're sponging off of him, and he's getting poorer. Then he makes a pass at the wife, she informs her husband, they both leave in a huff, and his finances improve. It seems to puzzle him, being an exception to the rest of the book, which seems to preach that morality always makes you wealthier....
There are surviving records of Ben Franklin visiting a number of sex clubs in England, most notably Wilkes club. Furthermore, there's his Advice to a Friend on Choosing a Mistress which recounts a number of his sexual escapades.