How old are you when you watched your first R-18 movie?

I have no idea, our movies were not rated at that time so we would end up watching anything. I always liked horror and gore, but an actual 18+ movies were completely dumb to watch as all of that are actors and nothing is real.
Instead I prefer to read stuff and I usually plundered the entire University library in search for some books that were extremely scientific for that particular field.