Abstract:
:This study tested predictions regarding two hypothesized maternal immune responses influencing sexual orientation: one affecting homosexual males with high fraternal birth order and another affecting firstborn homosexual individuals whose mothers experience repeated miscarriage after the birth of the first child. Low birth weight was treated as a marker of possible exposure to a maternal immune response during gestation. Birth weight was examined relative to sibship characteristics in a clinical sample of youth (N = 1,722) classified as heterosexual or homosexual based on self-reported or probable sexual orientation. No female sexual orientation differences in birth weight were found. Homosexual, compared to heterosexual, males showed lower birth weight if they had one or more older brothers--and especially two or more older brothers--or if they were an only-child. These findings support the existence of two maternal immune responses influencing male sexual orientation and possibly also cross-gender behavior and identity.
journal_name
Dev Psychobioljournal_title
Developmental psychobiologyauthors
VanderLaan DP,Blanchard R,Wood H,Garzon LC,Zucker KJdoi
10.1002/dev.21254subject
Has Abstractpub_date
2015-01-01 00:00:00pages
25-34issue
1eissn
0012-1630issn
1098-2302journal_volume
57pub_type
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journal_title:Developmental psychobiology
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journal_title:Developmental psychobiology
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