I read with interest about how to treat a model and how to talk to them.
My personal experience is that there are only two kinds of models. Those who are not sure, insecure, or too greedy and those who are confident, secure, and very easy going. It is the first kind of models who cause endless problems and it is better to avoid them. I am a little rough and curt while planning the shoot, so those who are in doubt drop out before we waste each other's time. The second kind of models will show up at midnight on my door, having never seen me, and will do whatever it takes to get good pictures.
I have had model who not only not mind my touching them (for posing instructions) but have asked me to do that and have asked me to help with adjusting dress (including underwear), hair, etc.. With new models I am careful about the choice of words and I have had some models burst into laughter when I used the word Hips. "I don't have hips, this is my ass!".
So yes, I am careful and respectful of the personal space of the model, but the unsure types are just too damn difficult to work with. I dont want to shoot constantly in fear of using wrong words, wrong gestures, or asking them to pose fearing what they would think. So I prefer to just walk away from such models.