I find facials fascinating, from a sociological/psycholog ical standpoint. Is it truly more demeaning than any sex act, if conducted between two consenting, intimate partners? Or is it simply the societal portrayal of it via pornography that plays it up and accentuates the humiliation aspect of it? I suppose that, since your face is the icon of your entire being and self, it could possible be degrading to have someone cover it in bodily fluids...but I digress!
I, personally, do not enjoy it simply because it kinda grosses me out, but as a submissive woman I would do it if it was asked of me.