Hallow, I understand your concern and ideas about masturbation. Masturbation is any act to seek for the sexual satisfaction without actually having the sexual act with any other person. Since you are a girl, I will explain you about female masturbation only. The women get their sexual excitement and satisfaction by touching or tickling clitoris. Clitoris is a small pencil like organ which is situated under the lips of private parts and just above the opening for passing the urine. If this organ is touches dry, it causes discomfort or even pain. By handling this organ the excitement feeling starts and spreads all over the private parts and even all over the body. Some women get this feeling by handling the smaller lips of their private parts (vulva) also. This is called as clitoral masturbation. The other type of masturbation is vaginal masturbation in which some self organ like finger or such shaped object is inserted in vagina to get the excitement. In this type of masturbation, the hymen ruptures and some amount of bleeding takes place in initial few attempts. Hymen is a thin membrane located at the opening of vagina. In olden days, it was supposed to get ruptured during first sex. However, now a days due to the changed life style of the girls, it is ruptured even before that. Cycling, climbing trees, athletic games, sitting astride also rupture the hymen. Please remove the filling of sin attached to the masturbation from your mind. Masturbation is not a bad act or bad practice. Masturbating is a normal physiological act followed by many women in their life to satisfy the sexual urge when they do not have access to the sexual partner. However, while masturbating cleanliness and hygiene needs to be maintained, particularly while using the external objects. I am sure I have satisfied your curiosity and given you complete scientific knowledge about woman masturbation. If you need to have any more information, you may ask me direct question.