This is interesting to me. I have had a website advice column since 2001. My website was blacked out in Saudi Arabia in 2004. They have very strong controls on their web content. It surprises me that porn gets in.
Not totally sure about S. Arabia, but I know in Iran many use proxies to access banned websites. I’d imagine the Saudis and others can do the same. Besides, the Iranians can be very creative in smuggling porn stuff into Iran. Some have connections who turn a blind eye for some $$$ - money talks and walks!
I expect that is not an accident.