There may be a point on optionally blocking pure, meant to be porn, sites. But when you block wikipedia, youtube, art galleries, xkcd, social sites and so on be

There may be a point on optionally blocking pure, meant to be porn, sites. But when you block wikipedia, youtube, art galleries, xkcd, social sites and so on because it could show somewhere some skin or talk about life as it is, you are forcing people to skip your filters in the best case, and get disconnected to good part of the digital world in the worst with all that could come after that.