Sure, it should be available to those who wish to view it, but how do you reduce the risk of minors coming into contact with it?
It's called being a parent and raising your children. Any parent who really wants to protect their children against this kind of thing can be 99.9% effective. You simply need to watch what your children do every moment of every day.

As your children grow, they will go thru different phases. The interest in sex is just another phase. When your children are going thru this phase, you will be aware of it (if you spend enough time with your kids).

If you're the kind of parent who "doesn't have time for that" then, your kids are doomed anyway because there is NOTHING in the world more important than your children. And, if you "don't have time" for this, well.........enough said.

I don't believe the raising and teaching of our children is up to the schools, the government or the internet. It's up to the PARENTS.

Since most of the people on this site are half my age, I would expect some resistance to my opinion.