Yes. I've had thought about going through all 4 bases with just about every last female friend I currently have. Fantasising is normal and if a girl is my friend that means she does have attractive qualities of some kind.
Also just because I may have has one or two thoughts does not mean that I would want a relationship with them or that I think about them in that way all the time.
All my closest friends are female, sometimes it is difficult to work out your feelings. Some of them I think it would be really hot to be with, some not (not related to how attractive they are - on an emotional level) I really don't know my feelings towards my best friend, I love her - as a friend, but I don't know if I want something else too. Sometimes I think she does too, but other times :/.
Simple answer: Yes :)
I only think about kissing when I really like someone. But yes, sexual thoughts are pretty much all the time.
If I'm friends with a girl, it means I like her personality but I don't like her sexually or romantically.
If I like a girl romantically/sexually, I hit on her pretty much as soon as I first-ever meet her. If she rejects me, I don't try to get to know her.
Totally. I always wonder how they keep their pubic hair, what type of vagina they have and what kind of nasty secrets they have.