Perverted Ojisan X Magical Harem
In a world where women dominate men, not needing them to have babies, a perverted Ojisan on Earth dies after having his dick ripped off from his body dies to a freak accident with a container of slime that hardened around his dick. After bleeding to death, he wakes up and finds himself in the new world.
"He's the chosen one."
"Why?"
"He's the demon king, the king of men... the person who will liberate the other men from their cruel fate."
"How?"
"I... I don't know but one of his victims told me that she was conquered by him through his 8-inch saber."
"An 8-inch saber? Is that even a saber?"