(Note: Spread Beaver was actually the name
of a band in Japan fronted by the X-Japan guitarist
"hide" [pronounced "Hee-day"] before his suicide.
The "showing the vaginal area" wording seems to
have been taken from a slang dictionary and has
no connection with the band.)
http://www.engrish.com/adultsonly/adultworld/source/spreadbeaver.html