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Birth order among homosexual men
Kenneth J Zucker1, Ray Blanchard, Marvin Siegelman
1Child and Adolescent Gender Identity Clinic, Child Psychiatry Program, ON, Canada. Ken_Zucker@camh.net
Psychological Reports
|April 4, 2003
Summary
Homosexual men tend to have a later birth order than heterosexual men. This finding is supported by empirical research, including a 1998 reanalysis of earlier studies.
Area of Science:
- Psychology
- Human Sexuality
- Developmental Psychology
Background:
- Empirical research has explored the relationship between birth order and sexual orientation in men.
- Previous studies have suggested homosexual men have a later birth order compared to heterosexual men.
Purpose of the Study:
- To summarize existing empirical research on birth order and male sexual orientation.
- To highlight a reanalysis of earlier findings concerning birth order and homosexuality.
Main Methods:
- Review and summarization of empirical research.
- Reanalysis of a previously reported null finding.
Main Results:
- Homosexual men, on average, have a later birth order than heterosexual men.
- A 1998 reanalysis confirmed this finding, addressing earlier null results.
Conclusions:
- The birth order of homosexual men is consistently later than that of heterosexual men.
- This finding has implications for understanding factors influencing sexual orientation.