The Reverse Harem genre is a fairly new but very popular genre, and it has quickly become one of my favorites. For those of you that are unfamiliar with reverse harem it is a one girl-multi boy-universe. But it is far more than mere romance. Authors have combined the reverse harem genre with other genres and that equals AWESOME!!!
Author C.L. Stone was the first reverse harem author that I read, and she quickly got me hooked on the series. The Ghost Bird series is a young adult reverse harem/mystery and Sang Sorenson is drawn into the world of the Academy by 9 guys that become her world. There are a lot of unanswered questions surrounding Sang and Ashley Waters, the school she attends. The series isn't finished yet, and I, for one, am not ready for it to end.
Other series, like Curse of the Gods and Last Hope, are not young adult and contain sexual content (so be warned) but they are no less awesome for being adult. Curse of the Gods is fantasy and Last Hope is religious fantasy. Both are great series.
The few series that I have mentioned here are by no means the only examples of reverse harem. Like any genre, some reads are naturally better than others and everyone has their own tastes. If you have yet to experience the reverse harem you should reach out of your comfort zone and pick one up.