Should sex and violence on television or in the movies be restricted?

In many ways this is a free speech issue. I think as a society we should always error on the side of allowing too much speech before we limit speech. That said I think it is ok to allow some rules for over the air television broadcasting during daytime hours since it is freely available and such a part of our society. I think cable or satelite television should be free of these restrictions because they are a product purchased by a consumer with the choice as to whether or not to purchase them. I think movies fall into this category as well. With rating systems and parental controls there are additional tools to help parents choose what their children can watch.