0721の日 オナニーの日
A day celebrating and encouraging [[masturbation]]. While English-speaking countries celebrate on May 28, the Japanese version of the date is a number pun (0721= o-na-ni-i).

h4. External links

* "Twitter: 7月21日はオナニーの日":[https://twitter.com/hashtag/7%E6%9C%8821%E6%97%A5%E3%81%AF%E3%82%AA%E3%83%8A%E3%83%8B%E3%83%BC%E3%81%AE%E6%97%A5]
* "Wikipedia: National Masturbation Day":[https://en.wikipedia.org/wiki/National_Masturbation_Day]
masturbation day