Reflecting several comments on this topic here on this site, fewest girls really LIKE this. The thing that makes them like it is that they want to give their boyfriends a pleasure. And facials are special to some guys (personally I completely dislike them :P).
And as for drinking the cum... well, that's dependent on the guy I suppose... come is a natural product and it's getting influenced by several means (food, time to reproduction, etc..) so the fluidity (does this word exist? I got no idea :D) is different, the smell can be from fruity (yes, possible!) to something words are unable to describe (in a bad way!)...
Anyways resulting in:
If a girl "likes" it, you can be sure that her affection towards you is for real!