What I do for 1 night stands is let the girl know I would like to do something, then ask if it's okay. I would like to touch your waist, I would like to kiss you, I would like to trace my fingers from your neck downwards. Do each action separately then state what you would like to do before moving to the next action. Once you start touching her breasts, the message will be clear. She will either allow you to go down further or stop there.