There are four seasons in Japan. This is the same as the United States, it is spring and summer and autumn and winter.
Unlike America, the Japanese season, but the difference in the temperature is away. Temperature rose to 40 degrees in summer, winter temperature drops to minus 10 degrees.
So, a lot of people naked in the summer.Because they are too strong moral fiber, they are not to excited to see the opposite sex naked.
I think the Japanese wonder.