A prehistoric man was living alone in a cave when one day a woman showed up.

“Let me move in with you,” she said.
“What for?”
“I’ll keep the cave clean.”
“It’s already clean.”
“I’ll cook for you.”
“I hunted a mammoth and roasted it. I’ve got food.”
“Just let me stay for one night. You’ll see.”

The man thought it over and let her in.

They spent the night together in the cave. The next morning, the man stepped outside, stretched, looked down between his legs and said…

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