Do it..I sometimes trade with my hot older sister, and she only wears thongs (usually black or red). Started doing it as a joke/dare, and her saying I wouldn’t do it. So, I called her on it, and told her to take off what you’re wearing now, and I’ll put them on. Felt weird at first, but then, I started to like it, and knowing they’d just been all up inside of her. Now, we’ll do it as often as we can..