It is a traditional clothing worn by native male inhabitants of some (mainly highland) ethnic groups in Papua including in the Grand Baliem Valley, it is worn without other clothing, tied in upward position to cover their genitals.
Koteka or penis gourd, are normally made from a dried-out gourd (Lagenaria siceraria).
The koteka is made of a specially grown gourd. Stone weights are tied to the bottom of the gourd to stretch it out as it grows. Curves can be made in it by the use of string to restrain its growth in whatever direction the grower wishes. They can be quite elaborately shaped in this manner. When harvested, the gourd is emptied and dried. It is sometimes waxed with beeswax or native resins. It can be painted, or have shells, feathers and other decorations attached to it. They are usually decorated by local women, who’ll embroider them with twine, shells, seeds or tassels.