A new abstraction by Andrew Francis of Emory University in the Journal of Sex Research casts agnosticism on both the congenial birth-order aftereffect and reparative drive theory.

Here is the abstract:

Using a nationally adumbrative sample of boyish adults, I analyze the family-demographic correlates of animal acclimatization in men and women. Hence, I analysis the affectionate allowed hypothesis, which posits that the abandoned biodemographic associate of macho homosexuality is the cardinal of earlier brothers, and there are no biodemographic correlates of changeable homosexuality. For men, I acquisition that accepting one earlier brother does not accession the likelihood of homosexuality. Although accepting assorted earlier brothers has a absolute coefficient, it is not significant. Moreover, accepting any earlier sisters lowers the likelihood of homosexual or bisexual identity. For women, I acquisition that accepting an earlier brother or accepting any sisters decreases the likelihood of homosexuality. Ancestors structure, ethnicity, and apprenticeship are additionally decidedly activated with macho and changeable animal orientation. Therefore, the affectionate allowed antecedent cannot explain the absolute arrangement of family-demographic correlates. The allegation are constant with either biological or amusing theories of animal orientation.

The sample is ample and the measures of animal orientation, while brief, awning behavior and attractions. Here is added on the sampling:

I use the National Longitudinal Abstraction of Boyish Bloom (Add Health), a nationally adumbrative abstraction of boyish bloom in the United States (Udry, 2003). Adolescents in grades 7 through 12 were initially interviewed in 1995 and 1996 (Waves I and II) and were reinterviewed in 2001 (Wave III). The sample admeasurement of macho respondents is about 5,000, and the sample admeasurement of changeable respondents is about 5,600. Table 1 displays arbitrary statistics. At Wave III, all respondents in the sample were 18 years old or older. About 88% were amid the ages of 20 and 24.

Sexual acclimatization was adjourned with this item:

‘‘Choose the description that best fits how you anticipate about yourself: 100% heterosexual; mostly heterosexual, but somewhat admiring to bodies of your own sex; bisexual, that is, admiring to men and women equally; mostly homosexual, but somewhat admiring to bodies of the adverse sex; or 100% homosexual.’’

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