Revision summary
Incest taboos forbid sex inside a culturally named kin set. Lévi-Strauss tied the rule to exogamy and alliance. Westermarck tied it to childhood familiarity. Genetics adds inbreeding cost but not the cousin map. Gotra and clan extend the ban beyond the nuclear house.
Model answer
Copper italics in this answer — like this — are the key facts. Each one is unpacked in the Facts & figures rail.
Introduction
An incest taboo forbids sexual relations inside a named kin circle. The circle varies, but some ban on closest kin is very widespread.
Body
What is forbidden
- Nuclear incest with parent or sibling is nearly universal as a rule, though breach is known.
- Lévi-Strauss said the taboo is the start of culture: it forces exogamy and the exchange of spouses.
- Westermarck argued childhood proximity kills desire, a view later linked to the Kibbutz and Taiwanese sim-pua cases.
- Freud inverted this: desire is there, and the taboo represses it. Malinowski used Trobriand data to dispute the Oedipus shape.
Biology and law
- Inbreeding risk is real, as genetic counselling still shows. That does not by itself write the local list of forbidden cousins.
- Indian gotra and clan rules extend the taboo far beyond the household.
Flow diagram
flowchart TD TAB[Incest taboo] --> EXO[Exogamy exchange] TAB --> W[Westermarck familiarity] TAB --> G[Inbreeding risk]
Conclusion
Incest taboos protect a kin boundary and push marriage outward. Alliance theory, familiarity, and genetics each explain a piece, not the whole list.
Quick related
Students also ask
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Is the taboo biologically wired for every cousin?
Close inbreeding is costly. Which cousins are banned is social, as cross-cousin marriage shows.
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Does every society ban the same people?
No. Sibling and parent are widely banned. Parallel cousins may be kin or preferred spouses.
Same topic · past papers
UPSC has asked this before
These previous-year questions sit on the same topic. Open one to practise the earlier ask.
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2026 · Q3(b) · Anthropology GS 1 · 15 marks
Discuss 'incest taboo' as the basis of development of kinship systems in human societies
More from this topic
Q3(b) · UPSC Mains 2026 · Anthropology GS 1 · 15 marks · Solution
Discuss 'incest taboo' as the basis of development of kinship systems in human societies
Marriage
• The incest taboo is a universal cultural rule banning sexual and marital relations between primary close kin. • It directly enforces exogamy, forcing individuals to seek marriage partners outside their immediate family unit. • E.B. Tylor argued early societies had to "marry out or be killed out" to achieve broad societal integration and peace. • Claude Lévi-Strauss viewed the taboo as the negative side of reciprocity, driving the circulation of partners to build inter-group alliances. • Leslie White noted the taboo is uniquely human, marking the exact threshold where biology (nature) transforms into culture (kinship). • Far from being just a restriction, it acts as a generative principle that weaves isolated biological units into expansive social webs.
Q7(c) · UPSC Mains 2024 · Anthropology GS 1 · 15 marks · Solution
Discuss the applicability of various sampling techniques in selecting the study group.
Marriage
Simple random and systematic sampling require a usable frame. Stratification ensures analytically important minorities are represented. Cluster and multistage designs suit dispersed regional surveys but need design-effect adjustment. Purposive sampling selects information-rich cases; theoretical sampling develops concepts. Snowball sampling reaches hidden groups but carries network bias. Anthropological sampling should combine transparent inference, ethnographic depth, non-response analysis and ethics.
Q1(d) · UPSC Mains 2023 · Anthropology GS 1 · 10 marks · Solution
Customary laws and Environmental conservation.
Marriage
Customary law governs land, water, and forest through taboo, fine, and office. Sacred groves in Kodagu, Kerala, and Meghalaya are standard Indian examples. Ostrom’s commons design matches many of those local rules. Chipko and Niyamgiri show custom in political defence of habitat. Custom can fail under market pressure, so recognition must be empirical, as in the Forest Rights Act.