There is certainly a link with Angel - after all, the Angel -> Angelus transformation, while initially ambiguous, is purely a sex thing. Angelus is certainly more confident and charismatic than Angel, but as far as having a stronger sexuality, there's not a lot of examples I can recall... he's focused on drama and violence, and any sexual encounters have their motivation in psychological warfare rather than desire. Angel is, however, a good example of a male hero who goes 'bad', including sexually, and then returns to being a hero (even if he has to work a lot harder at it).