My sons got in a very bad situation in which they looked at porn and had to come tell me. (at the time they were 14 and 11)
They were looking up video game cheats. At the top of one of the pages was an add for porn that had a picture of a near naked woman. Intrigued, they hit the link and found other links.
Unfortunately, at this point pop screens of very deranged acts began to spring up and they didn’t know how to stop the pop ups. Luckily they came to me. But I think that porn must still be somewhere on my hard drive.
By the way, the computer is in the family room. It only took them a few seconds to find the porn that they weren’t initially looking for in the first place.