To become a man in the primitive tribe Papua, New Guinea, boys are removed from the presence of all females at the age of seven, living with other males for ten years. During the ten years, the skin is pierced to remove any contamination brought upon by women. For the same reason, they also regularly incur nose-bleeding and vomiting caused by consuming large amounts of sugarcane.
The Sambians top off their bizarre rituals by requiring the boys to ingest the semen of their elders, which is thought to sustain growth and strength. When they are finally introduced back into the tribe, they continue to engage in nose-bleeding at the same time as their wives’ menstrual cycles.
The details are just so bizarre and can be read at the Tripod.