Probably because it's a bunch of muscles contracting.
Mastubating
No, masturbation will not cause problems. But you have to understand that your body is not mature enough sexually.
I think no!
dont think so..
Yes, just look how god spited Michelle Visinho
Sure. As long as the lesbians don't mind.
Yes totally normal if you enjoy it keep doing it!
That really is up to you. We don't all have the same stamina or the same degree of sexual excitement. Try once a day.
As long as it doesn't become overly preoccupied with it. Generally if a person can masturbate, they will.
No. it will not. But it will do, make your bonds weak. and you will lost your hairs and many other genetic issues.
No. Unless a guy ejaculated on them earlier and it happened like, 3 or 4 minutes ago. But one would tend to think that a girl should know somethings wrong when her panties are wet, and she didn't make them wet.