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In the 1990s, Blanchard and Bogaert proposed\xa0the Fraternal Birth Order Effect (FBOE). Men with more older brothers were more likely to be gay. \u201cThe odds of having a gay son increase from approximately 2% for the first born son, to 3% for the second, 5% for the third and so on\u201d.

https://www.astralcodexten.com/p/how-are-the-gay-younger-brothers\xa0