WHAT'S WRONG WITH KIDS THESE DAYS!?

This is just something I'm wondering about. So, I was reading fan fictions on Wattpad. I was reading a real good vkook one, skipping over the smut parts. The next page, the author posted their age. What the hell is 12 and 13 year old kids doing writing smut? Like, this isn't the first one where I was surprised by the age. Normally, people would be surprised by the grammar of young authors (cause these kids have great vocabulary in their stories). But, I'm totally mind blown that like middle school aged kids writing some of the most sexual things and know all these kinks and shit. Am I the only one who is shocked by this? Is this totally normal now?