Keep your filth in the open air long enough, and it becomes clean

Enjo kōsai (援助交際, Enjo kōsai?), or "dating for assistance", is a practice in Japan where high school-aged girls are paid by older men to accompany them on dates and sometimes to render sexual services.

Most observers, especially overseas, regard it as a form of child prostitution, although it need not involve sexual activities; it often does not even involve kissing or holding hands.

Enjo kōsai is linked with the consumerist kogal subculture. It appeared after the end of the 1980s economic boom, and many observers believe that it serves as a way for young girls to preserve the lifestyle of that era, despite their families' more difficult financial situations. [citation needed] Others, especially within the Japanese academic establishment, see enjo kōsai as a coming-of-age ritual that has naturally developed in Japan's contemporary capitalist society. [citation needed]

Prostitution has been illegal in Japan since the 1950s, though the definition of prostitution is narrow—only genital-genital contact falls under the law. Special laws concerning prostitution of minors have been in place since the 1990s. However, enjo kōsai has not been regulated by the Japanese government, as it does not fall within the legal definition of prostitution unless the client expressly pays the girl for sex (which is rare, given the indirect nature of the transactions). Because the age of consent in Japan ranges from 13 to 17, depending on jurisdiction, enjo kōsai clients often cannot be charged with statutory rape.
-http://en.wikipedia.org/wiki/Enjo_k%C5%8Dsai