For example, Trobriand Islanders prohibit both sexual relations between a woman and her brother, and between a woman and her father, but they describe these prohibitions in very different ways: relations between a woman and her brother fall within the category of forbidden relations among members of the same clan; relations between a woman and her father do not.
Pavyzdžiui, Trobriando salų gyventojai draudža seksualinius santykius tarp vyro ir jo motinos bei tarp moters ir jos tėvo, tačiau draudimų pagrindimas yra skirtingas: santykiai tarp vyro ir jo motinos patenka į draudžiamus santykius tarp to paties klano narių, o moters ir jos tėvo – ne.