There are approximately 1500 Baruya people living in the Wonenara and Marawaka valleys.
They have a ritual in which boys give fellatio to young males and drink their semen, to 're-engender themselves prior to marriage'.
The ritual is a lengthy process and can be divided into four stages for the initiates: At the age of nine, young boys are taken from their mothers to become Yivupbwanya and as a result their women skirts are cut short at the front and removed from behind while their noses are pierced.
At age eight they begin to ingest semen from older males twelve and up.
At the age of twelve, the skirts are completely removed and replaced with a male multi-layered skirt and a narrow strip of bark is worn behind, and their noses are pierced with a large nose peg.