I'll help.
This means EXPLICT content such as things that are rated M for mature.
Things with swearing included in it...
I'm pretty sure your real life doesn't include this, so go on and post it.
When you have trouble on whether to post a pic or not cuz you think it's inappropriate, use Rule#1, and don't do something you'll regret.
If you haven't read the rules yet, Rule one is:
On a G rated site.
Don't be stupid. Which means simply to use your common sense. Follow this rule, and the others will follow.