Posting sexual material or engaging in sexual behavior with anyone under 18 is illegal. Sexting, roleplaying, or posting smut with a minor involved puts everyone at risk. The worst case scenario is that someone underage is taken advantage of. Someone older, not being careful can also be labeled as a sex offender.

Sex is a normal behavior and teens will engage in it, one way or another. Educate yourself and any other potential minors. Below are some resources for anyone who wants to learn more. Stay safe.

https://what-is-privacy.com/2012/02/what-children-and-teens-should-know-about-sexting/
http://roleplayingconfessionsfromrpers.tumblr.com/underagesmut
https://www.justice.gov/criminal-ceos/citizens-guide-us-federal-law-obscenity