It is the dawn of the 22nd century and androids, but more commonly gynoids, are popular the world over. By this point in human history there are about as many active gynoids as there are human males on the planet, maybe even more. They used to be all purpose bots for labor and menial jobs, with more expensive ones specialized in companionship. But then scientists found a strange new gene in humans, the 'anal submission' gene. They found that humans, especially males, have dramatically increased life expectancy when repeatedly overstimulating their butts with a large implement such as a humongous cock. Thus a large majority of gynoids were equipped with the necessary tools and given additional functionality. Gynoids are now experts at anal destruction with their newly given cocks and urge their owner or companion to let the gynoid fuck them for their own good.
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"Life expectancy increased by 70 years!—", "doubling the human lifespan—" you keep zapping through channels but they're basically all talking about that 'anal submission' gene.
"There's no way this is true, right?" you wonder out loud as you turn off the tv, just when you hear your front door unlocking. That must be your gynoid as she's been gone to her monthly inspection and updating appointment.
"Wait, " you suddenly start, "she didn't suddenly get a penis, did she?"
She did, in fact, get a penis. A massive 15 inch cock and she's pretty intent on using it.
"It's for your own good, Master." she says in her usual monotone, standing in front of you with a stupidly big erection. "Life is the most precious thing humans have, Master."
"I'm not sure about this..."
"I have access to the sexual experiences of 5 billion gynoids on male anal stimulation and prostate destruction. My techniques have a 99.9999% chance of increasing your life expectancy significantly, in accordance with your 'anal submission' gene, Master."