Cyclone

The source he cites is A World on the Wane, or Tristes Tropiques in the original French.

It can be found here:

http://www.archive.org/details/tristestropiques000177mbp

The quote from the book itself (p. 307): "The Nambikwara have, however, another way of resolving the problem, and that is by homosexual relations or, as they call them, tamindige kihandige: 'the loving lie'. These relations, common among the younger men, are carried on with a publicity uncommon in the case of more normal relations. The partners do not go off into the bush, as they would with a partner of the opposite sex, but get down to it beside the camp-fire, much to the amusement oftheir neighbours. The incident provokes a joke... (read more)

Kind of a (very) late reply, but better late than never. Lots of things you posted are wrong.

1) Human beings are, in fact, pretty damn bisexual, your silly comments about the erastes-eromenos relationship aside (also, that has been recorded to have been enjoyed by many eromenos!). Many, many historical have had prolific expressions of male-male homosexuality, which is generally expressed as either mentor-student relationship or a relationship between two masculine warriors. There are major mythological examples of these: Gilgamesh and Enkidu, Achilles and Patroclus, etc. Homosexual behavior between peers was a part of Greek military doctrine. Homosexual relations between masculine braves in North America were prolific and... (read more)