Last modified on April 2, 2019, at 12:47

Homosexuality and genetic mutations

Mutations result from errors during the DNA replication process or other types of damage to DNA (such as may be caused by exposure to radiation or carcinogens).

Left-handedness is a good indicator of a high mutational load.[1] People who are left-handed higher incidences of autism and schizophrenia.[2]

In 2000, The journal the Psychological Bulletin published an article entitled Sexual orientation and handedness in men and women: a meta-analysis and the abstract for the journal article declared:

The authors conducted a meta-analysis of 20 studies that compared the rates of non-right-handedness in 6,987 homosexual (6,182 men and 805 women) and 16,423 heterosexual (14,808 men and 1,615 women) participants. Homosexual participants had 39% greater odds of being non-right-handed. The corresponding values for homosexual men (20 contrasts) and women (9 contrasts) were 34% and 91%, respectively.[3]

Dr. Neil Whitehead writes about left-handedness and homosexuality:

Using their results it is possible to derive a number, which shows the extent of any link there may be. Here's how it's done. Given that 2.7% of adult Western males are homosexuals and 1.7% of adult Western women female homosexuals, (both figures including bisexuals, and defined as activity in the last 12 months3 we can calculate by standard methods that only 3.9% of left-handed males are homosexual and only 3.3% of left-handed females are lesbian.4

In other words the overwhelming majority of those who are left-handed when young do not become homosexual. The strength of any underlying factor producing both is weak. Something unusual happens to a small number of left-handed people and their sexual-orientation development is atypical.

What might that be? Are there alternative psychological explanations of the effect described in the paper?

I suggest at least one - everyone knows that left-handed people feel in a minority, and different. Very many homosexual people attest to feeling different and not belonging when they were growing up. Left-handedness could increase feelings of difference and be one important factor in the complex leading to homosexuality. This could apply to both men and women and the authors quote a study in which non-right-handed women rated themselves as less feminine. Additionally feeding into this could be altered brain hemisphere dominance and the psychological effects of atypical gender-specific skills.

Conclusion:

Most left-handed children do not become homosexual. Conversely and importantly, most homosexual people are not left-handed. So the main routes to homosexuality are not via whatever causes being left-handed. There is a link or correlation to homosexuality but it is weak.[4]

The causes of homosexuality in individuals suggests that a person's free will is the ultimate arbiter of whether someone chooses to be a homosexual (see: Causes of homosexuality and Homosexuality and choice and Homosexuality and genetics and Ex-homosexuals).

See also

Notes