Their lower lip is perforated with a sharpened bone , and then a wooden labret is introduced .
When boys begin to show facial hair growth , they too undergo a puberty ritual , which is usually timed to coincide with a birth or female puberty ceremony .
boys ' lower lip is perforated with a sharpened bone , and then a wooden labret is introduced .
When boys begin to show facial hair growth , they too undergo a puberty ritual , which is usually timed to coincide with a birth or female puberty ceremony .