Italian artist Milo Manara's book Bolero takes a look at the history of mankind through the medium of strips of figures in the costumes of history. Including many figures in military dress and some violent and bloody vignettes there is also a healthy smattering of copulating figures as humankind progresses from prehistoric times to the year 2000. In fact, the message of the book seems to be that humans haven't progressed at all and are still obsessed with fighting and sex.
The book begins with this sequence where a lovely cavegirl is molested by an excited Neanderthal. His expectations are disappointed when a Cro-Magnon smashes his brains out with that prototypical caveman weapon, a wooden club. No respite for the cavegirl, however, as our more evolved ancestor flings her to the ground and takes her from behind resulting in a cave baby.
In reality, of course, there is some evidence for cross breeding (although, as ever, academics don't agree) between Neanderthals and modern man, in their joint Eurasian habitat, resulting in, for example, some genetic differences between Europeans and Asians and sub-Saharan Africans; the latter having less Neanderthal DNA.