I dont think the touchy thing is applicable to all women. Or maybe I am clueless
But a long time ago I was at a girls house.
She was kneeling down looking in a cupboard for something. I knelt down and put my arm around her shoulder with nothing more than a "what are you doing? Need some help buddy?" kind of way.
A long time later after we had become BF and GF she told me that when I did that she thought it meant that I would follow her into her room and screw her. And so off she went and waited a few minutes.
And of course I never followed.

*clueless*