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Canadian wheat overcomes Fan Baige of Mass spy university to head research group, to Tanzania with a ha plunge into tone of organ of person tribe clansman and birthrate to launch investigation. Breathing out the tribe that plunge into a person is the world the real support that retains only hunts and collect existent primitive tribe, was not affected by element of contemporary birth control. "We discover in research, the male breed capability with relatively grave organ is stronger, have more descendants, " Fanbaige says, "And organ tone and unborn mortality and nonrelevant. "And organ tone and unborn mortality and nonrelevant..

The research before this discovers Fan Baige, the female is attracted more easily by the male with grave organ, think they are more mature, healthy; And the woman that the male prefers throat pitch, think they have more glamour, docile, have feminine taste more.