PEOPLE of all ages often feel more guilty and embarrassed about masturbation than about any other sexual activity, but it is an instinctive thing for people to do and not at all dirty or unnatural.

It is enjoyable, it's the way most boys and many girls first discover what sexual pleasure feels like and is a natural way to start learning about sexual responses. All stories about masturbation being able to harm you physically are totally untrue. Nor can masturbation "spoil" you for sex with a partner.

http://www.thesun.co.uk/sol/homepage/deidre/sextherapy/article2093881.ece