Homosapian-Neanderthal romance scandalizes cave.
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Modern humans started doing their thing about... 100,000 years ago, give or take a few millenia. The thing is Neanderthal were still kicking it until like 20,000 years ago, when they went extinct. Now, you have know that at some point Nargurk looked across the stream at Cargla "Homosapian Babe" Fraghk and thought, "Oh I would definitly hit that". Well, now we have science to prove it.
this same thing happens in those Clan of the Cave bear prehistoric sex novels my sister was always reading.