When Was The First Anal Scene Released?

Woke up to a tweet from the lovely and talented Tristan Taormino and we had a nice little back and forth:

So, I’m, back in the office and can look such things up, so here are the exciting results — the first ten movies we have that mention anal sex.  It’s by coincidence that that’s everything before 1974.

I do not really consider this definitive, but it’s a good starting point for a discussion…