Not even Superman can see thru these undies. In Japan where there are a lot of sukebe (perverts), one company has come up with Shot guard line of undergarments. Apparently this line of clothing "make photography difficult." Japan, with its peeping problem and the prevalence of men to take pictures of women and children with night vision capable camcorders/ cameras is where the marketing of such undies is occurring. Apparently they're working on shot guard bras also. Somehow the undergarments work by chilling those areas. It'll cost you about 2000 yen (20 bucks) for a pair. If I were in Okinawa, I'd probably invest in a pair since it's always so hot in the summer. Here are some other articles on it, Perv Proof, Anti Spying, or the garment homepage

Disclaimer: I don't believe that Japan has any more perverts than any other country.