Hiding sex from children is just dumb.
We ALL saw porn as kids. For me it was the 1970's and finding my dad's porn mags and it was freakin' AWESOME!
No, none of us want to think of our kids masturbating and looking at porn. But guess what? They do. Just like we did.
Sex is natural. And like it or not, your kids know about it, look at it, and when they are teenagers they DO it. (just like we all did).
But yeah...I'm sure that sooner rather than later...enough sexually repressed/religious nutcases are going to raise enough hell about free porn for "the innocent children" to see, that it's going to ruin it for everyone.
EDIT: Meanwhile, those same parents that want to "protect" their kids from seeing sex...are more than happy to let them watch violence in movies and television and play violent video games.
Apparently KILLING = good. SEX = bad.
Pretty fucked up.