While in some societies polygamous relationships are acceptable, it remains a taboo topic in most societies, where having multiple partners is even frowned upon. Updated Sep 26, 2023 Harem anime can be formulaic fun classics like Ouran Host Club and Rosario + Vampire have plenty of surprises for the subgenre's fans. Few anime subgenres are as distinctively niche as harem anime, where seemingly everyone is in love with the show's protagonist.