The "Secret' is the key ingredient of child sexual abuse.

The 'Secret' is the bond established by the abuser with the child victim.  It ensures that nobody knows of the abuse other than the abuser and the abused. It is kept in place by embarrassment, fear, respect; even love.
Embarrassment that friends or family will find out what happened. An emotion sometimes secured with photographs. Fear for the safety of the child and their family should they disclose anything - fear that the abuser will inform – parents – friends, about the behavior their child has been pulled into and subjected to.

http://www.abusewatch.net/child_thesecret.php