It could be some sort of territorial/tribal thing.
I question the thing about Dolphins being the only species that has sex for pleasure. I'm fairly sure that there are some monkey species that do it too, including the one that practises homosexuality and the one where the females prostitute themselves for food and better nesting spots. And let's not forget dogs humping legs.
There is one species of Dolphin which is the only other animal that remains alive after its sexually active years, so grandparents help raising children.
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Spending as long as I do here, it's easy to forget that Oddworld has actual fans.
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