I have a female tabby of 2 years old, and she hasn't been neutered. Whenever she's on heat she meows all day and night, which to be honest is as expected, but if I laugh, whistle or rub my thighs vigorously she'll run over from the other side of room, meowing loudly and very high-pitched, jumps onto my fore-arm (as if mounting it), bites the top of my hand and scratches my fore-arm with her back legs. I'm not too fussed about it as I find it pretty funny (for now anyway) but I would like to know what inspires her to do so, and if anyone else is having the same issues?! When I rub my thigh and she runs over, I get the impression that she is jealous of the attention; but this would not explain when I whistle or laugh. She is a very loved cat so she gets plenty of attention, but she doesn't go outside and has never experienced other cats.