Lessons from manga: never go to the beach by yourself, or someone will think you're going to kill yourself, and will tackle you into the water to save you.
(I think Seagull Villa used this twice, maybe 3 times?)
-Harem but all the girls get tired of fighting and just date each other instead
..
Actually, it's common in many harem themes that the girls get along and wouldn't mind sharing the dude and fricking with each other. What I actually wish to see is two girls who compete for one dude but later on actually realize they love each other instead more than that dude. I've yet to find such a development in any work. Maybe The Fourth Heroine is a close one.
Korra already got mentioned, that's good. Some Macross Frontier fanfics head that way, with Sheryl and Ranka having more chemistry with each other than either with Alto, who could easily be moderately asexual.