Almost every culture has rules and customs that censure marriage between people who are closely related by blood, often viewing such unions as incestuous and hence taboo.
Peaaegu igas kultuuris on oma reeglid ja tavad, mis mõistavad hukka lähedaste veresugulaste vahelised abielud ning tavaliselt peetakse selliseid liite verepilastuslikeks ja seega tabuks.