January in Japan is as cold as in other northern parts of the hemisphere. But the freezing temperature does not deter thousands of men running in the streets with nothing but a loincloth on them. Hadaka Matsuri is a festival for ritual purification held in different forms across Japan. In Inazawa, men in loin cloths struggle to touch a naked man called Shin-otoko for good luck. These naked festivals are fun events but with undertones of spiritual significance.