The exit of the tunnel is concealed.

They yearn for a secret hiding place, where adults would not venture to follow them in case they ever did anything wrong.

There is a hidden world behind the one we all see. For all of us.

Carving out a bit of privacy online has wide appeal; students, community groups and even political dissidents can use these hidden networks to share projects, papers and information.

Every woman has secret sex fantasies that she wants to try, but many girls are too shy or nervous to introduce their sex fantasies to their boyfriends or husbands.