Please help...freakish bodily function?

Ok...let's just say that I know a 20-something year old woman who can without stimulating herself in any way. Basically, if she becomes enough whilst thinking thoughts or watching , she can without having touched any part of her body at all. She's been able to do that since she was like 16, and she only recently discovered that it was indeed s she has been experiencing. I've done some research, and it seems that about 2 percent of the female population can do this. Have any of you heard of anyone being able to do this? It's very weird, no? I'd appreciate any and all input, pleeeease!!!