Dear author, the hero's women love the hero and do not have sex with strangers. So, dear author, write a novel to your taste, but I hope that it will be (an open sex world) and that the hero moves from his world to this crazy world.
You a cuck? What you just said, says you are.... Free Use means everyone shares each other... and that's NTR (cuckhold).
What he should actually write is "Reverse World" where women are the aggressor when it comes to sex, and the men in that world are prudes who find the sex crazed attitude of the women to be disgusting.
A good example (the only one I can find that's a complete story) is "Man of the House". There is another story I've read called "A Pervert's World" where it's Free Use, and the MC has to share his women with everyone... the story was really good, which is why I kept reading it, but having the MC be cucked by his dad, his male cousin and many other random men really lowered my rating.