Haven’t you read about Vault 68?
1,000 men, and you’re the only woman, locked in a vault with nothing to do, but you.
They respect you, at first, but it doesn’t last long. The doctors take you off your contraceptive, you might be the only female left in the world after all. A lottery is held, three times a day, to see who gets the chance to impregnate you.
To make it easier, they synthesise a drug that keeps you constantly horny, and never lets you cum. It helps, a little.
At least in your third trimester you only have to give handjobs and blow jobs.
Just for their own amusement, Vault-tech sent your husband to Vault 69. Twisted bastards.