Outtake:

Scientists also uncovered this ancient sign in New Zealand.
You smell like you're related to my last mate, so we should have sex. That sentiment appears to apply to female fruit flies. Let's say you're a fly and you've mated once. You're given the choice of the same partner or a completely new one. What do you do? If you're a male, you go for the new partner; if you're a female, you stick with the familiar one.
Now, what happens when you swap out the familiar mate, and substitute one of its siblings? You get roughly the same result: males go for the novel partner, while females prefer the familiar one (although it's a weak preference). How does this work? The researchers did the same tests with flies that carried a mutation that blocked their ability to sense odors. The preferences went away entirely—for both sexes.
If it messes you up, it probably does some good things, too. This study is a bit of a two-for-one, but both messages provide a bit of perspective on why humans seem to be incapable of listening to...
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