Drew Berry: Animations Of Unseeable Biology

Biological Differences Between Gays & Straights 

Wikipedia shows:

Physiological

Some studies have found correlations between physiology of people and their sexuality. These studies provide evidence which they claim suggests that:

• Gay men report, on an average, slightly longer and thicker penises than non-gay men.^[50]
• Gay men and straight women have, on average, equally proportioned brain hemispheres. Lesbian women and straight men have, on average, slightly larger right brain hemispheres.^[51]
• The VIP SCN nucleus of the hypothalamus is larger in men than in women, and larger in gay men than in heterosexual men.^[52]
• The average size of the INAH-3 in the brains of gay men is approximately the same size as INAH 3 in women, which is significantly smaller, and the cells more densely packed, than in heterosexual men’s brains.^[31]
• The anterior commissure is larger in women than men and was reported to be larger in gay men than in non-gay men,^[30] but a subsequent study found no such difference.^[53]
• Gay men’s brains respond differently to fluoxetine, a selective serotonin reuptake inhibitor.^[54]
• The functioning of the inner ear and the central auditory system in lesbians and bisexual women are more like the functional properties found in men than in non-gay women (the researchers argued this finding was consistent with the prenatal hormonal theory of sexual orientation).^[55]
• The suprachiasmatic nucleus was found by Swaab and Hopffman to be larger in gay men than in non-gay men,^[56] the suprachiasmatic nucleus is also known to be larger in men than in women.^[57]
• The startle response (eyeblink following a loud sound) is similarly masculinized in lesbians and bisexual women.^[58]
• Gay and non-gay people’s brains respond differently to two putative sex pheromones (AND, found in male armpit secretions, and EST, found in female urine).^[27][59][60]
• One region of the brain (amygdala) is more active in gay men than non-gay men when exposed to sexually arousing material.^[61]
• Finger length ratios between the index and ring fingers may be different between non-gay and lesbian women.^{[55][62][63][64][65][66]}
• Gay men and lesbians are significantly more likely to be left-handed or ambidextrous than non-gay men and women;^[67][68][69] Simon LeVay argues that because “[h]and preference is observable before birth^[70]… [t]he observation of increased non-right-handness in gay people is therefore consistent with the idea that sexual orientation is influenced by prenatal processes,” perhaps heredity.^[31]
• A study of 50 gay men found 23% had counterclockwise hair whirl, as opposed to 8% in the general population. This may correlate with left-handedness.^[71]
• Gay men have increased ridge density in the fingerprints on their left thumbs and pinkies.^[71]
• Length of limbs and hands of gay men is smaller compared to height than the general population, but only among white men.^[71]

Cognitive

Recent studies suggest the presence of subtle differences in the way gay people and non-gay people process certain kinds of information. Researchers have found that:

• Gay men^[72] and lesbians are more verbally fluent than heterosexuals of the same sex^[73][74][75] (but two studies did not find this result).^[76][77]
• Gay men may receive higher scores than non-gay men on tests of object location memory (no difference was found between lesbians and non-gay women).^[78

Richard Dawkins Explains How The Gay Gene Was Preserved

Yes, the debate isn’t over. Biology is a strong card on this topic.