Thank you for any info you can give to assist in this matter.
A good parent should enlighten their children to the fact that the world
is made up of people with widely divergent views and belief systems. It
sounds like you'd rather stick your neck in the sand than discuss in an
honest and frank manner with your children your real concerns about
their exposure to objectionable material.
More to the point, warn children of the disturbing images that appear on
the Net (e.g. the sexual exploitation of women and children). You're
fooling yourself if you think they're not going to make every attempt to
seek out exactly those websites their parents consider taboo.