Butterfly Board

A butterfly board is a sex toy used in some play piercing games. It comprises a card or wooden board with a hole cut to the shape of the male genitalia. The board is placed over the genitals and the skin of the edges of the penis and scrotum is pinned with needles or nails to it.
Found on http://www.probertencyclopaedia.com/browse/AB.HTM
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