Scarecrow: Success… Fame, fortune… They’re all illusions. All there is that is real is the friendship… That two can share. Dorothy: That’s beautiful. Who said that? Scarecrow: I did. [pause] I’ll think of you all the time.
Arms around her waist, head thrown back exposing her neck to him, his hands locked signalling he wants to keep her there, her hands hold onto his signalling she wants him there, close hugging from behind is a sexual gesture; particularly from a man to a woman, because it puts the most intimate parts (genitals, bottoms) into intimate areas. Only extremely close tacticle friends would hug closely from behind. Otherwise it’s safe to assume the person wants, or is already, having sex with you.