He did, he wrote "be careful" in addition to +16.
Indeed, usually, not always.
In context with "be careful" clearly it means its unlikely safe for work. Better safe than sorry at work.
A good guess would be in the OP's country 16 is the age requirement for something with similar content. An even better guess is it was an account created to troll. lol
If you read the entire thread, you'd note that the "be careful" was edited in AFTER the original post.
Even if it WAS there, by your logic, "be careful" means a link has nudity in it?
So, "Short film be careful (+16) " equals NUDITY? No way.
I think the moral of the story is for dudes, mates, and blokes, to please post a
clear disclaimer about a link they post up here on AO.
Oh, and "be careful" around here...