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There were tons of humanoid species around before we killed them all. Neanderthals, etc. Wonder why they're dead? Could be this.
We did fuck with Neanderthals too, though. There's still traces of their DNA in modern humans, I think
Homo Sapiens be like "interbreed/marry/kill"
It's why aliens avoid us. They know how horny we are.
As the distance between two species widens, viable (ie, not sterile) offspring become rarer and rarer (although not impossible), so there would be a biological incentive not to "waste time" banging something that looks too different from yourself
Meanwhile otters and dolphins are raping baby seals for fun.
Everyone needs a piece of side action, even early homo sapien sapien.
The original EEE