Typically, no.
But there are exceptions, naturally.
Example:
Known poster with excellent reputation.
Known model/slut-who-got-pounded that belongs in my collection.
Let's say Arovane (I think everyone knows him) posted just links to a Sasha clip from one of the thousands of sites she's worked for in the last week
I would take it on faith that it was safe, quality and therefore, no need for caps.
I think you get my drift