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Why has same-sex sexual behaviour persisted during evolution?

  • Written by Brendan Zietsch, Associate Professor, The University of Queensland

Same-sex sexual behaviour may seem to present a Darwinian paradox. It provides no obvious reproductive or survival benefit, and yet same-sex sexual behaviour is fairly common — around 2-10% of individuals in diverse human societies — and is clearly influenced by genes.

These observations raise the question: why have genes associated...

Read more: Why has same-sex sexual behaviour persisted during evolution?

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