I was reading in a manga awhile back about a form of energy controlling called "the bedding technique." It is the belief that when a person is trained the right way, they can literally control a person's chi through sex and enhance it/dimish it according to their will.
It sounds farfetched, but accupuncture and accupressure works based on ancient beliefs about chi, and whether or not they are right or not, they figured *something* out about how the body responds. I have no idea if this is actually a real thing, though. If it is, I'd appreciate it if someone could point me in the direction of some information on it, and if not then I'll know that I can make some stuff up about it (my story is fantasy so I have more leeway, but I'd like this based in fact if at all possible).
Thanks in advance.