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.
लगभग हर संस्कृति में ऐसे नियम और रिवाज़ पाए जाते हैं जो नज़दीकी रिश्‍तेदारों के बीच शादी करने की निंदा करते हैं ।