Well any porn could damge a youngster, since their brains aren't ready to take the role of knowing how the world works with sex and that. I didn't know until very late on (don't know exactly my age), but I didn't know anything like that.
I was kept pretty much safe from it all.
One reason I guess, is we didn't have a computer, etc.
But now, kids aren't even safe from that, so the new generations etc are definietly growing up differently, to a sex based society much quicker.
Nope, I haven't seen 40 year old virgin, but its meant to be funny.