Jane wakes up under the bear fur that she shares with two other females. It’s 100,000 years ago, and it’s freaking cold outside. The fire at the entrance of the cave has been reduced to a few glowing embers. She glances over at Bobnick, the only male who was left behind by the hunting party, and whose mission is to protect the females. His skinny ass is fast asleep near the almost extinguished fire, with a spear laying near him. Jane grumbles and walks towards the entrance, where she throws a couple of sticks on the fire. If the fire dies, it’s a pain in the ass for everyone.
She then goes out of the cave and squats to relieve herself on the ground. She smells like grease, sweat and shit, but she’s still one of the most attractive females of the tribe: her hips are wide, her breasts are heavy, she still has almost all her teeth, and there is meat on her bones. When she turns back she notices Bobnick, who woke up, staring at her naked ass. She smiles and winks seductively at him. She hates this useless fucker, but if the boys don’t come back from the hunt he’ll be the only male available to protect the tribe.
It’s been four nights since the hunting party has left, and still no sign of them. The females are starting to become agitated, hungry, and above all, afraid. What if they don’t come back? It will mean death for a big part of the tribe, unable to sustain itself. During the day they go to gather fruits and seeds in the nearby forest under the protection of Bobnick and his spear, then they stay in the cave, sowing or polishing stones. But there isn’t much to do and mostly, they talk. If the hunting party doesn’t come back, Bobnick becomes the de facto leader of the group. He was left behind because he’s the weakest of the males, and usually the whole tribe makes fun of him, and nobody shows him much respect. But now, every female is eyeing him and smiling at him.
Jane is Chadrock’s main female -or at least she competes for the top position. She knows how to gently lay on his lap and lick his penis when he’s resting, she knows how to ride him to shivering orgasms, and she knows how to stroke the back of his head to make him fall asleep at night between her breasts. Chadrock also fucks other females, in particular Uma who is younger, and Jane always has to improve her game to keep him coming back to her. Chadrock is who all the females want: he’s the best hunter, it seems like he leads the boys (although they always talk serious stuff away from the females), and he’s fucking huge. Jane loves Chadrock.
But now it’s getting late, and she’s eyeing Bobnick. Uma is sitting near him and giggling and caressing his hair. Bobnick is visibly happy but can’t believe his luck just yet and he’s not doing anything. Maybe the boys will be back tomorrow? Jane can’t take the risk, she can’t let Uma have him. She has to preserve her place at the top of the female hierarchy. Jane walks to them and squats in front of Bobnick, opening her naked ass and winking at him, just like she did in the morning when she was taking a shit.
That’s too much for poor Bobnick who throws Uma to the side and jumps on Jane, and immediately starts to fuck her furiously. She’s not wet and it hurts, but the pain is nothing compared to the pleasure of seeing Uma’s angry face in the corner of her eye.
Jane is moaning sensually to make this go faster, but then a shadow fills the cave and her moans change to screams, as she suddenly tries to push Bobnick away. A huge wooden mass comes slamming on the side of Bobnick’s head, and his brain splatters on the cave wall while Jane escapes from under him. It’s Chadrock. With one hand, he throws Bobnick’s dead body to the side like a piece of wood. He and the other males behind him carry a lot of meat, they look exhausted. Jane starts to thank him profusely, saying that Bobnick forced himself on her, but Chadrock cuts her short with a heavy slap to the face. She falls back on the ground, she can taste blood in her mouth. Chadrock then throws the meat to the side, and starts to fuck her. Chadrock is way bigger than Bobnick, but it doesn’t hurt. She’s instantly wet. She’s relieved too, the anguish of the past days has vanished, they will survive. And he chose to fuck her first instead of Uma. Jane is happy.
This has been going on for approximately 200,000 years. Modern society has only existed for a few centuries (less than 1% of that time). Guess how our genes are wired?