rita 
I've actually been wondering about animal groupings where you get one male and a herd of females and we deem them to be "his".
We can't actually ask animals what they're up to and what they're motivations are, all we can do is observe - but these observations, same as everything else, are done through the prism of our own preconceptions which includes sexism.
We see these males like they're some kind of eastern potentate with his harem, but what if its not that at all? If you think about it a small herd of female human could live together in a harmonious commune doing everything for themselves and only require one male that they would use for reproduction. They could keep him in a shed so they didn't even have to talk to him.
When their daughters grew up they could leave the commune to join another one to prevent inbreeding and the women could trade their sons with other communes to replace herd males who were getting a bit past it.
The kept man would get pretty aggressive when a new, younger alpha stud turned up, because once he's replaced he's left alone in the wilderness to fend for himself - something he's never had to do. But the new man would want to fight for his place in the herd because its the best means for his own survival. Damn right the males would fight over the females, but its their place as 'kept man' they're protecting, not the females as their property.
What if, in the animal kingdom, it isn't the females that belong to the males at all, but the other way round? In every species you need more females than males to keep the species going, its more important that more females survive - what if, instead of alpha males keeping themselves a herd of females, its a herd of females keeping themselves a sperm donor?
It doesn't actually change anything for gender roles in human society, but it would be funny if it turned out that the assumption of male supremacy in nature turned out to be just more male bullshit - like all those centuries they believed that women were just mutated men ... oh dear .. 