1. However, practically, any culture that practices such would be suspending incest taboo . 2. They observe strict incest taboos , including taboos against marriage within a clan. 3. Without the sibling relationship, there isn't the incest taboo ." 4. The incest taboo rises because of a desire for incest. 5. By custom, marriage must cross clan boundaries ( a form of incest taboo ). 6. L�vi-Strauss proposed that the initial motivation for the exchange of women was the incest taboo . 7. James Richard Ellis has argued that the incest taboo is fundamental to a civilized society. 8. Alliance theory is based on the incest taboo : according to it, only this affinity. 9. Some researchers argue that the prohibition against Suns'marrying Suns was largely a matter of incest taboo . 10. "We have cultural systems _ such as incest taboos _ to do that, " he explains.