I am fortunate in that I was homeschooled and thus socially isolated, so I had few “friends” to subject me to most of that stuff. I saw some of the bigger ones, like tubgirl, but didn’t discover a lot of others until I was a bit older and worked at a web host.

For the ones I did see, I probably saw a reference somewhere and my curiosity caused me to look them up on AltaVista or Yahoo! My phone’s keyboard did not like one of those words.