To be kissing is a must. I don't fuck, cum and go. If I just want a hole I would just stick with waking or buy sex toys. I enjoy the passionate/intimate bits of sex and the human aspect (no doesn't mean I would grow attached to them), and to do that it doesn't matter if it is GFE or PSE, no kissing would make the whole experience feels rather cold.
Personally there isn't really a fantasy aspect for me with WGs, i see it for what it is, ie a fuck with someone other than the OH. If i want attention i can get plenty of that elsewhere, if i want to fuck an Asian/black/Romanian/Polish girl, i see a WG.....but i have no intentions of getting in a relationship with those types of women (not that there's anything wrong with that, i just wouldn't).
Realistically it's an easier way than going out clubbing to pull a girl, and much less risky. Also considering i'd have to go out on the pull in another city, meaning hotels etc, it's also cheaper. It's a means to an end for me, nothing more, nothing less. I'm under no illusions that she is there for a reason, and so am i. I see no advantage in getting fake affection, nor putting her in a position where she feels she has to provide it.
But that's just my 2p, each to their own.