The singles group says the ban is unfounded. They point to their first cruise on Carnival's Elation in December that drew about 300 women and the men they call "cubs."
Carnival says there were no problems with last month's trip, it's just a business decision. They have no room for groups with that "theme."
Analysts say it's meant to protect Carnival's focus on family fun.
Party planners say they've had no trouble booking with rivals Norwegian and Royal Caribbean.
