Why does Homosexuality Evolve?

Homosexual sex doesn’t lead to reproduction. So given that evolution by natural selection favours genes that increase an organism's reproductive success, why does evolution not drive homosexuality to extinction?

Watch the "evolution of things" playlist:
   • Why does Homosexuality Evolve?  

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Watch More:
Richard Dawkins on homosexuality and evolution.
   • Darwin Day Questions: How does evolution e...  

Dig Deeper:
Fruit Flies: http://rspb.royalsocietypublishing.or...
8% of sheep are gay: https://academic.oup.com/endo/article...
LargeSwedish twin study: http://link.springer.com/article/10.1...
http://puvodni.mzm.cz/Anthropologie/d...
https://darwinbookcats.wordpress.com/...
http://www.towleroad.com/2014/11/scie...



Music:
"Walking Along" and "No Good Layabout" by Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
http://creativecommons.org/licenses/b...
Jazz in Paris by Media Right Productions (YouTube Music Library)