A small PSA to all those new to dealing with the porn bots that Tumblr now has a fresh wave of – I understand that when you go to report them, you want to report them as "[containing] sexually explicit material", but don't do that. Report them as spam instead.
These are spam bots flooding tags and the website in general with spam links. They often do not have anything sexually explicit on their blog (although they often have implicit material). Plus, these two reports get very different results. Reporting explicit material gets the bot slapped behind an 18+ wall, so minors can't check if they're a bot or not. Reporting spam gets the bot taken down.
Remember, folks: when dealing with a bot, report spam, not smut!