Why does Homouality Evolve?

Homoualdoesnt lead to reproduction. So given that evolution by natural selection favours genes that increase an organisms reproductive success, why does evolution not drive homouality to extinction?\r
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Watch the evolution of things playlist:\r
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Watch More:\r
Richard Dawkins on homouality and evolution.\r
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Dig Deeper:\r
Fruit Flies: .\r
8% of sheep are gay: \r
LargeSwedish twin study: \r
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Music:\r
Walking Along and No Good Layabout by Kevin MacLeod (incompetech.com)\r
Licensed under Creative Commons: By Attribution 3.0\r
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Jazz in Paris by Media Right Productions (YouTube Music Library)