Yes he did. Walter Isaacson's recent biography includes it, and this is an honest historical site. Not a fart joke, but here is Franklin's advice to his son on taking an older mistress rather than a younger one:
http://teachingamericanhistory.org/l...p?document=468
Among my favorite sayings by 'Poor Richard': "A fortress and a maidenhead are both lost, once they begin to negotiate."