Masturbation

I'm quite amazed by Freud's statement about masturbation being acted out by each one of us through our childhood stages. As childhood is meant to be a period of life where everything is innocent, and masturbation is a huge part of an adult world. Children at young ages like to explore and find out about new things, whether that be a book, a toy or even a cardboard box. Therefore even if a child does touch certain areas of themselves could this not be done simply out of curiousity than having a sexual desire to do so?

http://www.med.umich.edu/1libr/yourchild/masturb.htm