You're going to get to jerk off and your going to need some dirty panties. Your girlfriends or wives are not acceptable. They can either be your mothers or if you have a daughter over 18, hers.
They must be used so you're going to have sneak a pair out of the wash basket. What excuse will you use if you get caught rooting through dirty clothes for a used pair of panties? Imagine the shame of getting caught by your mother or daughter with a bulge in your jeans and their panties in your hands.