originally a Japanese word, & believed to be an actual ritual.
This is when a group of guys get together, to randomly jerk off on the naked body of just one person.
It is thought this was originated by Japanese Porn Producers, to circumvent the censorship laws of the time.
Believed to have been introduced in the 1970's
For more info visit:Gaydemon Dicktionary.
The concept is that a group of guys get together, to shower one naked guy with their cum.
It is this 'ritual' that gave rise to Facials, so they claim.
