Oh Boy! A MOP!
The MOP is a weapon that can be stolen from Nu's if pleasured by Ayla's spell, Charm. There are a few Nus throughout the game, so as soon as Ayla learns the spell, feel free to use it.
I recommend getting it from the Nu at Hunting Range in 65,000,00BC.
But to be completely truthful, the MOP isn't a good weapon, but really more for show.
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