When one member of a cover band loses his wife to another woman, it triggers a chain reaction that over the course of one day turns the band into a sort of group marriage, with the option to expand by adding someone's mother.
A young man who has inherited a lot of money is in a boring job. He meets a young lady who is engaged to be married and his boss's daughter. He loses his job because of his friendship
Pa had three sons who courted the girls at the neighboring farm. It was hard for them to pick three out of the five girls to marry. The girls had two sisters left behind so Pa marries both the two remaining girls. (I guess you can do that in fantasies and on scattered farms). Pa had to trade his daughter Annie in marriage to Zeke, the father of the 5 girls. Who gets which girl Pregnant is the essense of the story.
Deeply religious Jo returns home from college to discover her parents and brother are into a swinging lifestyle. She is blackmailed first by her brother into exhibitionistic activities leading to her rape and pregnancy. Her parents will only help if she submits completely as sex slave.
A spaceship is going to colonize a new planet. Towards the end of the trip, a major goal is increasing the colonist population rapidly. To conserve resources, people spend most of their time asleep, often awakening just long enough to procreate. Then Jason is found to have a gene which makes him the preferred father for every new baby. 'How do I fuck thee? Let me count the ways.' Emotional positions, not physical.
After unwittingly impregnating three members of a Korean swim team visiting his American university, our hero adds an unlikely fourth tally after the team's middle-aged coach comes onto him while drunk (with a little blackmail on her part to incentivize him).
When you fall asleep - it's your conscious mind that sleeps! Your subconscious mind never sleeps. As a matter of fact, your subconscious mind is responsible for your dreams - good, bad, ugly, beautiful, horrific... The subconscious human mind runs on a totally different power source, than the rest of your body, controlling every function, every thing - in your life.