Harem is a location in a game Total Seduction. It can be accessed if the quest Gather the Harem is ongoing or completed. You can control the harem from the throne - you can either gather all harem girls here, order them to kneel in front of the throne or go to beds. Only "harem girls" will obey your orders - you must tag a harem girl by giving her imbued necklace. She must also have Seduction Level 4 to accept the necklace.
There is a special vending machine at the harem room, that can dispense special aphrodisiac drinks. Each drink will immediately restore 50 Lust.