The fraternal birth order effect — whereby the probability of a man being gay increases with the number of older biological brothers — has emerged for the first time in an animal model. The fraternal birth order effect exposes that some homosexual men have a larger #FraternalBirthOrder #LGBTQ #AnimalResearch #Thetweetdoesnotmentionanyspecificcountries.Therefore #therearenocountrycodestoreturn.



