The most comprehensive way to explain that if one identical twin is gay or lesbian, there is a 50 percent probability that the other twin is also gay or lesbian is that:

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The most comprehensive way to explain the 50 percent probability that one identical twin being gay or lesbian means the other twin will also be gay or lesbian is that multiple factors, both biological and social, contribute to sexual orientation. Therefore, it is likely that if one identical twin is gay or lesbian, the other twin may have also inherited some of the same biological factors that contribute to sexual orientation. However, social factors may also play a role, as twins often share similar experiences and environments that could influence their sexuality. Studies have shown that genetics alone cannot fully explain sexual orientation, and that other factors such as upbringing and environmental influences must also be considered.

The Most Comprehensive Way to Explain That If One Identical