You stand behind her and close enough without touching her but you can smell her perfume n body splash or the shampoo smell coming from her hair.
This is where it gets tricky. You put your hands in your pocket n lean back so her booty can size up your member.
To her, she be like dayam boi, how you know it's supper time n you brought with yourself them hmong sausage.
The butt cheeks have plenty of nerves endings so she can feel it like it was her hand. Don't believe me? Try it out for yourself. You give a chick your booty so she can grind on you. If she shave, you will feel her vagina bone. If she bushy, you can feel that too. I kid you not. If i loses my hands, my butt cheeks gonna be my new hand. Oh wee, got me all excited about this.