Whatever the differences, they would have been attractive enough to Homo Sapiens to breed with.
Maybe not willingly, though. Look up Danny Vendramini's neanderthal predation theory, and consider that modern X chromosomes carry no neanderthal DNA, indicating that all interbreeding involved neanderthal males and human females.
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Maybe not willingly, though. Look up Danny Vendramini's neanderthal predation theory, and consider that modern X chromosomes carry no neanderthal DNA, indicating that all interbreeding involved neanderthal males and human females.