unhook a bra one-handed
Worth doing!
Best way to do it... — 2 years ago
..is to snap your fingers.
Reach around her and gently pull the strap away from her back with your index finger, just enough to give your other fingers leverage. Then put your thumb and middle finger on either side of the strap, push them together, and snap your fingers. The bra comes undone easy as pie, and you usually get a look of amazement from the girl. Totally worth it.

