The task of making sure every shot in a porn film is consistent with the shot that came before as well as e one to follow. For instance of you're shooting a sex scene that's going to take 2 days to shoot and the female talent shows up the 1st day with a full bush. And she shows up o set the 2nd fully shaved then you've definitely got a cuntinuity problem! she'll have to wear a merkin to finish the shot so to speak!
I had to keep cuntinuity on 5hoots before I got a small stand in role as a stunt cock double!