When a guy makes that first move on the dance-floor in hope of action in the bedroom.
A Waist Pull won't give the impression he's gonna be an arsehole and treat her like a piece of shit...
A Shoulder Pull ie putting arms on top of the shoulders is the contrary - this tells a woman you are definitely going to be a hard cookie to crumble and a less sensitive soul for that night and thereafter - if.
A Shoulder Pull does however suggest the sex might be dangerously fantastic together though.. that's for sure.
His Shoulder Pull scared me and caused all this hassle."
Next time - try the Waist Pull.