Not really, as evidenced by the hypersexual Aka people of central Africa:
The tribespeople, like Ahmadinejad, claimed there was no homosexuality of any kind in their culture. "The Aka, in particular, had a difficult time understanding the concept and mechanics of same-sex relationships," [anthropologists Barry and Bonnie Hewlett] write. "No word existed and it was necessary to repeatedly describe the sexual act … we thought that maybe they were shy or embarrassed, but this would have been uncharacteristic of the Aka that we had known for so long."
Apparently, the Aka aren’t alone in their homo-naivete. In 1976, another team of anthropologists sifted through the Standard Cross-Cultural Sample data for attitudes toward homosexuality and found that people in five of 42 cultures listed had no concept of same-sex desire or behaviors. It’s not that these cultures penalized or disapproved of homosexuality. Rather, they didn't even know what it was.
As Jesse Bering quips, "[T]here really are societies in which homosexuality does not exist; Iran’s just not one of them."
The Dish 