Once hooked, there is an escalation in need for rougher and more sexually shocking material in order to get the same sexual stimulation as before. There is, in time, a desensitization to the material's effect. What was first gross, shocking, and disturbing becomes, in time, acceptable and commonplace. Pornography is used by child molesters 1. to stimulate themselves, 2. to lower the inhibitions of child victims and 3. to teach the children exactly what the molester wants. Pictures are taken of the child during molestation to blackmail the child into keeping the secret and to serve as the molester's substitute for the child when the child is not there.
Many molesters actually believe the experience is good for the child.