So I found this story a while back two or maybe a year ago. It was a story about a guy and his wife who were trying to have children getting stranded on an island. They get captured by women who dominate the Island. The husband is exposed to an aprodisac that destroys and transforms his balls and his sperm into an anti aging agent for the women. Meanwhile the wife is slowly seduced by the dominant lifestyle the women share over both the non breeding men and the breeding Bulls. I can't find it anymore and I can't recall the name.