Harem is an arabic term, but the harem concept has existed everywhere. You'd be fooling yourself if you think it doesn't exist today, only we'd call it a professional brothel service. There are types of these services that cater specifically to politicians and the president himself (if needed). One needs to realize that being in a harem, wasn't necessarily the worst thing as those in the harem were often represented as having greater power or more socioeconomic status then the commoners outside the palace.