Twin studies— the strongest evidence
Over the last decade, studies of twins have provided some of the strongest numerical evidence that “Our genes do not make us do it”— which makes this chapter probably the most important in the book. Results from twin studies are quantitative, so they greatly focus and sharpen the results of many other studies we’ve mentioned so far.
In a nutshell, if you take pairs of identical twins in which one twin is homosexual, the identical co-twin (a monozygotic (MZ) twin) is usually not homo sexual. That means, giv en that identical twins are always genetically identical, homosexuality cannot be genetically dictated. No-one is born gay. The predominant things that create homosexuality in one identical twin and not in the other have to be post-birth factors. Hold on to this simple thought as you navigate the complex world of twin studies in the pages of this chapter
Thanks reading it now.