A remote where homosexuality does not exist challenges postmodern western ideas of sex, love, marriage and babies:

"Barry and Bonnie Hewlett had been studying the Aka and Ngandu people of central Africa for many years before they began to specifically study the groups' sexuality. As they reported in the journal African Study Monographs, the married couple of anthropologists from Washington State University "decided to systematically study sexual behavior after several campfire discussions with married middle-aged Aka men who mentioned in passing that they had sex three or four times during the night. At first [they] thought it was just men telling their stories, but we talked to women and they verified the men's assertions."

In turning to a dedicated study of sex practices, the Hewletts formally confirmed that the campfire stories were no mere fish tales. Married Aka and Ngandu men and women consistently reported having sex multiple times in a single night. But in the process of verifying this, the Hewletts also incidentally found that homosexuality and masturbation appeared to be foreign to both groups.

... The finding with regard to homosexuality is perhaps not that surprising. As the Hewletts note, other researchers have documented cultures where homosexuality appears not to exist. If homosexual orientation has a genetic component to it -- and there is increasing evidence that it does, in many cases -- then it would not be surprising that this complex human trait (one that involves non-procreative efforts) would be found in some populations but not others.

... But, the Hewletts suggest, "The bonobo view may apply to Euro-Americans (plural), but from an Aka or Ngandu viewpoint, sex is linked to reproduction and building a family." Where sex is work, sex may just work differently." -- The Atlantic