I think that you are asking too much. sure sex is great, the special feeling that you get when you are in a relationship is the best... but having a friend to be there for you sure beats being alone.
There's been a lot of cows to milk (hah, thanks for that analogy Will) and when they are gone, I don't care. It's the girls who were true friends to me that I miss more than anything else.
Any chick who waves her pussy at you and doesn't put out is no friend at all.
The only way I could be friends with one is if we were already fucking. I think most guys are the same way... if they're being honest with themselves.