i think both are true, and for some its simply a way of being who they are and often it begins unintentionally and for others its a lifestyle in itsself.
or a release from day to day life and simply an enjoyment of the fun that can be had,playing in the parks, colouring pictures, having some control from educating the little one in various different ways
and for others it can be a safe way of actually having a childhood they were perhaps robbed of and never learned to 'grow up' and they gradually 'grow up' through it... a kind of therapy perhaps?
plus the sex side is good tooalthough that can be and sometimes is potentially dangerous.
an old thread but interesting and just a thought or two of my own.