sentences:  Drunken monkey hypothesis
  
  The drunken monkey hypothesis proposes that human attraction to ethanol may derive from dependence of the primate ancestors of "Homo sapiens" on ripe and fermenting fruit as a dominant food source.Ethanol naturally occurs in ripe and overripe fruit when yeasts ferment sugars, and consequently early primates (and many other fruit-eating animals) have evolved a genetically based behavioral attraction to the molecule.