The extreme example is bees. All females have the genetic potential to become queens or workers, but it's due to an external factor (royal jelly, in this case) that takes effect during development.
It's likely that all humans have the genetic potential to be gay or straight, but it takes an extra bit of hormone at the right time to make the "gay" genes turn on. That trait gets propagated because it's the most powerful kind of adaptive trait: the ability to adapt.
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