Protecting children from harmful materials does not have to grow into excessive extremes as many believe. And if more care, focus, and priorities were placed on our children, there actually might be less of those problems in their lives to encounter. If the beast is trying to enter the home, it is better to secure the door rather than leaving it ajar.
So, going by that analogy, parents should provide their children with chastity belts.
Yes, if more care, focus and education would be placed on children instead of depriving them of vital information, some problems could be avoided. But like I said before, parents prefer to avoid talking about the "difficult" things and instead keep their kids in a bubble which will pop when they enter the real world.
The thing is, I believe a lot of these conservative people simply use their children as an excuse to censor and ban things they're against. But enough about the kids thing because it's getting tiring. At the end of the day, developers, publishers and the rating systems do their jobs, and if a parent doesn't, that is entirely their problem.
You say you don't want to see violence and digital sex, and that's fine, it's your choice. But that does not mean that those things should be censored or removed. Freedom of expression, remember that? Also, you always have the option to skip the digital sex.