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The fraternal birth order effect has been described by one of its proponents as "the most consistent biodemographic correlate of sexual orientation in men". [5] In 1958, it was reported that homosexual men tend to have a greater number of older siblings (i.e., a 'later/higher birth order') than comparable heterosexual men and in 1962, these findings were published in detail. [6]
Birth order refers to the order a child is born in their family; first-born and second-born are examples. Birth order is often believed to have a profound and lasting effect on psychological development. This assertion has been repeatedly challenged. [1] Recent research has consistently found that earlier born children score slightly higher on ...
United States. The demographics of sexual orientation and gender identity in the United States have been studied in the social sciences in recent decades. A 2017 Gallup poll concluded that 4.5% of adult Americans identified as LGBT with 5.1% of women identifying as LGBT, compared with 3.9% of men. [107]
The relationship between handedness and sexual orientation has been suggested within both sexes and may reflect the biological etiology of sexual orientation; work by Ray Blanchard has linked the relationship to the fraternal birth order effect, which suggests that a man with several older biological brothers is more likely to be homosexual.
In 2022, the Journal of Sex Research published a study of 26,542 men and 33,534 women that had entered same-sex unions in the Netherlands as compared with 4,607,785 men and 4,405,635 women that found robust evidence of a fraternal birth order effect on both male and female homosexuality and no support for a female fecundity effect, but the ...
A 2024 map of countries by fertility rate. Blue indicates negative fertility rates. Red indicates positive rates. This is a list of all sovereign states and dependencies by total fertility rate (TFR): the expected number of children born per woman in her child-bearing years.
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They studied the birth records to identify the effects of multiple birth, birth order, age of parents and the sexes of preceding siblings on the proportion of males using contingency tables, chi-squared tests and regression analysis. The secondary sex ratio decreased with increasing number of children per plural birth and with paternal age ...