Human sexuality comes in many forms, from exclusively heterosexual to exclusively homosexual. But seeing as homosexuality creates apparent reproductive and evolutionary disadvantages, listener Ahmed from Oslo wants to know: why are some people gay?CrowdScience presenter Caroline Steel examines what science can - and can't - tell us about the role of nature, nurture and evolution in human sexual attraction. She asks a geneticist what we know of the oft-debated 'gay gene', as well as looking into why homosexual men on average have more older brothers than heterosexual men.Caroline looks into the role of nurture with a developmental psychologist to answer a question from a CrowdScience listener from Myanmar. He wonders if the distant relationship he has with his own father has impacted his own feelings of attraction.She also learns about research into a group of people in Samoa who may shed light on the benefits of traditionally non-reproductive relationships for communities as a whole.Presented by Caroline Steel
Produced by Jonathan Blackwell for BBC World ServiceContributors:
Dr. Kevin Mitchell - Associate Professor of Genetics and Neuroscience, Trinity College Dublin
Dr. Malvina Skorska - Postdoctoral Fellow at the Centre for Addiction and Mental Health, Toronto
Prof. Lisa Diamond - Professor of Psychology and Gender Studies, University of Utah
Prof. Paul Vasey - Professor and Research Chair, Department of Psychology, University of Lethbridge
Vaitulia Alatina Ioelu - Chief Executive Officer, Samoa Business Hub(Photo credit: Ahmed Umar)

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