is there a difference when a guy puts his arm around your shoulders than when he puts it around your waist, or do they both kind of have the same meaning / purpose
Most Helpful Guy
They're not that different. Although I suspect an arm around the waist is slightly more likely to indicate interest (it's a more possessive way of 'grabbing' someone), I'm sure there are plenty of instances of waist-arming that are completely platonic (and plenty of shoulder-armings that are not).
Both acts can mean a variety of things and their meanings are nowhere near as obvious and set-in-stone as punching someone in the face, french kissing, or many other forms of touch.3