Rate Fassbender's unit in Shame

There is a lot of talk about Fassbender’s unit widely shown in Shame: “Golf club”, “elephant”..

You can see him in the first minute of this video

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How would you rate it? Which sizes do you think he has?

I claim it’s a body double, they use them in movies all the time for nude scenes. You don’t clearly see his face, and the physique does not match that in the t-shirt shots.

Anyway the guy in the shot looks about 6” flaccid so he’s probably 8” x 5.75.