genetic/biological evidence of homosexuality:   verything/wp/2014/06/04/the-science -of-sexuality-how-our-genes-make-us -gay-or-straight/       5/10/09/study-dna-identical-twins-c an-reveal-whos-gay     cience/gay-men-in-twin-study.html     cle/research.points.to.genetic.elem ent.in.homosexuality/35856.htm straight males carry gay genes:   ons/chaladze2016asb.pdf   fecundity enhances in female relatives of male homosexuals:   ticle?id=10.1371/journal.pone.00510 88   ys-dont-extinct.html   scientists find dna differences between gay men and their straight twin brothers:     ic-tags-linked-to-homosexuality-in- men-1.18530   female relatives of gay men have 1.3x as many children:   10.1111/j.1743-6109.2012.02785.x/ab stract androgen receptor gene linked to xq28   11   /11/study-gay-brothers-may-confirm- x-chromosome-link-homosexuality  
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