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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]
Compared to other multiple births, twin births account for 97% of them in the US. [6] Without fertility treatments, the probability is about 1 in 60; with fertility treatments, it can be as high as 20-25%. [7] Dizygotic (fraternal) twins can be caused by a hyperovulation gene in the mother. [8]
The human twin birth rate in the United States rose 76% from 1980 through 2009, from 9.4 to 16.7 twin sets (18.8 to 33.3 twins) per 1,000 births. [5] The Yoruba people have the highest rate of twinning in the world, at 45–50 twin sets (90–100 twins) per 1,000 live births, [6] [7] [8] possibly because of high consumption of a specific type of yam containing a natural phytoestrogen which may ...
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 ...
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.
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Francesca Farago and fiancé Jesse Sullivan have revealed the names of their newborns!. The Too Hot to Handle alum, 31, and the TikTok star, 35, became parents to fraternal twins — a boy and a ...
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