Wait, why is he automatically an F? A lot of these behaviors can fit ESTJ. It all depends on what is meant by things like "witty", "moody", "good with the ladies". Witty how? Moody how? How is he good with the ladies? None of those traits are specific to types. In fact, this says more about the OP's type than it does about the friend. What he may see as "witty", someone like me may see as "crudely unfunny". It all depends on what is meant. Mostly the only thing that is for sure is that the guy is an extrovert.
Trying to type based on functions/dichotomies is a bad idea.
That is what MBTI is about, it's usually quite easy to work through the dichotomies, as long as you actually know the person and you're not just an acquaintance (although some people project their personalities quite furiously). It is also quite hard to know 'off by heart' the exact qualities of the temperaments, most people pick to either learn them, or the dichotomy descriptions and differences.
It was a special occasion and he only opened up to a few friends. How is that Fe dominance? Wouldn't he open up about this sort of thing more often if it was his dominant function?
I say get away from trying to figure out S vs. N and T vs. F. That's very hard to do based on a list of traits. You're going to at least need to provide paragraph-length descriptions for that.
Start with temperament: NF, SP, SJ, NT?
Interaction style: Get-things-going or In-Charge (since he is apparently an initiator/extrovert for sure)?
If you know only those two things, you know his type.
The person isn't 100% guaranteed feeler material, but when was the last time you saw a T go out of their way to tell their family that they are proud of them? I've known FJs in particular to be the ones that initiate such expressions, especially in the right settings. Moodiness is not so type dependent, expressing it like so might suggest E/J, but that's a bit sketchy.
I like this temperament method of typing people, I never realized that it could be used in conjunction with the 'get things going' descriptions. I'd say the best way to type people is to use both methods. Thanks
Freude, schöner Götterfunken Tochter aus Elysium, Wir betreten feuertrunken, Himmlische, dein Heiligtum! Deine Zauber binden wieder Was die Mode streng geteilt; Alle Menschen werden Brüder, Wo dein sanfter Flügel weilt.