Skip to main page content
Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
, 230 (1), 33-7

The Prevalence of Male Homosexuality: The Effect of Fraternal Birth Order and Variations in Family Size

Affiliations

The Prevalence of Male Homosexuality: The Effect of Fraternal Birth Order and Variations in Family Size

Anthony F Bogaert. J Theor Biol.

Abstract

The prevalence of male homosexuality probably varies over time and across societies. One reason for this variation may be the joint effect of two factors: (1) variations in fertility rate or family size; and (2) the fraternal birth order effect, the finding that the odds of male homosexuality increases with each additional older brother. Because of these effects, the rate of male homosexuality may be relatively high (at least in terms of sexual attraction if not behavior) in societies that have a high fertility rate, but this rate has probably declined somewhat in some, particularly western, societies. Thus, even if accurately measured in one country at one time, the rate of male homosexuality is subject to change and is not generalizable over time or across societies.

Similar articles

See all similar articles

Cited by 3 PubMed Central articles

Publication types

LinkOut - more resources

Feedback