Sociosexually unrestricted parents have more sons: A further application of the generalized Trivers-Willard hypothesis (gTWH)

Kanazawa, Satoshi ORCID: 0000-0003-3786-8797 and Apari, Péter (2009) Sociosexually unrestricted parents have more sons: A further application of the generalized Trivers-Willard hypothesis (gTWH). Annals of Human Biology, 36 (3). pp. 320-330. ISSN 0301-4460

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Abstract

Background: The generalized Trivers–Willard hypothesis (gTWH) proposes that parents who possess any heritable trait which increases male reproductive success at a greater rate than female reproductive success in a given environment will have a higher-than-expected offspring sex ratio, and parents who possess any heritable trait which increases the female reproductive success at a greater rate than male reproductive success in a given environment will have a lower-than-expected offspring sex ratio. Aim: One heritable trait which increases the reproductive success of sons much more than that of daughters is unrestricted sociosexual orientation. We therefore predict that parents with unrestricted sociosexual orientation (measured by the number of sexual partners, frequency of sex, and attitudes toward relationship commitment and sexual exclusivity) have a higher-than-expected offspring sex ratio (more sons). Subjects and method: We analyse the US General Social Surveys and the National Longitudinal Study of Adolescent Health (Add Health), both with large nationally representative samples. Results: Our analyses support the prediction from the gTWH. Conclusion: One standard deviation increase in unrestrictedness of sociosexual orientation increases the odds of having a son by 12–19% in the representative American samples.

Item Type:	Article
Official URL:	http://informahealthcare.com/journal/ahb
Additional Information:	© 2009 Informa Healthcare
Divisions:	Management
Subjects:	H Social Sciences > HQ The family. Marriage. Woman Q Science > QH Natural history > QH301 Biology
Date Deposited:	05 Apr 2011 16:02
Last Modified:	13 Sep 2024 22:40
URI:	http://eprints.lse.ac.uk/id/eprint/30352

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