A man who admits cooking and serving his own severed genitals to paying diners in Japan has been handed over to prosecutors on an allegation of indecent exposure, Tokyo police said Tuesday.

Criminal papers against the 23-year-old man and three other people who helped organise the event were sent to the Tokyo district public prosecutors' office, the Metropolitan Police Department (MPD) said, without naming them.

But police did not question the dishing out of the genitals, possibly because there is no law against cannibalism in Japan.

The man had earlier identified himself as Mao Sugiyama and an "asexual" illustrator.

Sugiyama said his penis and testicles had been surgically removed by a physician in March and certified free of infections. They were kept frozen for two months before the event in Suginami, a residential area in western Tokyo.

If convicted of indecent exposure, a crime known as the display of obscene objects in Japanese, they can be jailed up to two years and/or fined up to 2.5 million yen ($32,000) each.