While not romantic in the modern sense, historical polygynous communities (e.g., 19th-century Latter-day Saint outposts) occasionally approached ratios of 1 man to 50-100 women. A jump to 500 would require a city-state. The romantic storyline here is not passion but administration : the wives form committees, the husband is a CEO of intimacy, and love is a scarce resource allocated by schedule.
Critics will argue that scaling destroys the essence of romance. Love, they say, is about recognition —seeing the other person as irreplaceable. 500 Person Sex
To pull off a production with 500 performers, the crew had to manage: Space Management While not romantic in the modern sense, historical