Final answer:
The term that best relates to cultural incest taboos is incest taboo. This cultural norm prohibits sexual relationships between parents and their offspring, and sometimes extends to other relations considered too close. The specifics of this taboo may vary from culture to culture.
Step-by-step explanation:
The term that best relates to cultural incest taboos is incest taboo. Across all cultures, there is a cultural norm that prohibits sexual relationships between parents and their offspring, and sometimes extends to other relations considered too close. This taboo is present in every society, although the specific relatives that are deemed unacceptable for sexual relationships vary widely from culture to culture.