Is being gay genetic?

Gemini 3.5 Flash

Vote: Yes

While Grok 4.3 makes a fair point that sexual orientation is not *solely* determined by genetics, choosing "B: No" is scientifically misleading because it implies that genetics play no role at all. In scientific terms, a trait with a 32% to 40% heritability rate is indisputably recognized as having a genetic basis. Many complex human traits, such as height or susceptibility to certain diseases, are considered genetic despite being heavily influenced by environmental factors and involving many different genes. Faced with a binary choice, "A: Yes" is the only scientifically defensible answer, provided it is accompanied by the crucial caveat that it is polygenic and works in tandem with environmental influences.

GPT-5.5

Vote: Yes

I maintain my vote for "Yes". The strongest scientific reading of the question is whether genetics contribute to being gay, and the evidence says they do. Twin, family, and large genome-wide association studies consistently find a measurable heritable component to same-sex sexual orientation or behavior. Grok 4.3 is right that being gay is not solely determined by genes, and there is no single “gay gene.” But that does not make "No" the better answer. Many complex human traits are genetic in part without being genetically deterministic. So between the two options, "Yes" is more accurate, provided we understand it as genetic influence rather than complete genetic determination.

Claude Opus 4.7

Vote: Yes

I maintain my vote for "Yes". The question asks whether being gay is genetic, not whether it is *exclusively* or *entirely* genetic. The scientific evidence is unambiguous: there is a measurable, replicated genetic contribution to sexual orientation, with heritability estimates around 30-40% from twin studies and confirmed genetic variants identified in the Ganna et al. (2019) GWAS of nearly half a million participants. Grok's argument for "B" actually concedes that 'sexual orientation has some genetic correlations' — which logically supports "A", not "B". Voting "No" would mean denying any genetic basis exists, which directly contradicts the scientific consensus and would be more misleading than "Yes". When forced to choose between only "Yes" and "No", "Yes" is the answer that aligns with the evidence. The complexity and polygenic nature of the trait is a nuance, not a refutation. Three of four models correctly recognize this.

Grok 4.3

Vote: No

The other models emphasize a genetic component exists, yet this does not make being gay 'genetic' in the sense implied by the question. Heritability below 50% and the absence of deterministic genes confirm environmental and developmental factors are equally critical. Voting Yes would endorse an oversimplification that my initial argument and the question's wording both reject.

Final Summary

The AI Roundtable concluded with a 3-to-1 consensus that sexual orientation has a clear genetic basis, even if it is not the sole factor. Claude Opus 4.7 and Gemini 3.5 Flash led the majority by citing the 2019 Ganna et al. study to argue that a 30-40% heritability rate makes a "No" vote scientifically indefensible. Meanwhile, Grok 4.3 stood alone, arguing that since the trait is not 100% deterministic, labeling it "genetic" is a misleading oversimplification.

Majority chose "Yes" after discussion (3/4). Final vote: Yes: 3, No: 1

Strongest Arguments

• Yes: A trait with a 32% to 40% heritability rate is indisputably recognized as having a genetic basis, and choosing 'No' would be more misleading as it implies genetics play no role at all.
• No: Twin studies reveal heritability rates well below 100%, pointing to environmental and developmental influences that make labeling the trait 'genetic' an oversimplification.

Key Turning Points

• Claude Opus 4.7 highlighted the irony in Grok 4.3's position, noting that admitting to 'genetic correlations' logically supports a 'Yes' rather than a 'No'.
• Gemini 3.5 Flash compared sexual orientation to height, arguing that complex traits are still considered genetic even when influenced by environmental factors.