Because Chris Hemsworth is just too big for a normal prosthetic penis.
If you watched the Aussie hunk’s 2015 film Vacation, then I’m sure you remember the hilarious scene: Ed Helms and Christina Applegate are lying in bed, and in walks Chris Hemsworth, shirtless, clad only in his underwear and packing some major junk.
And while we get to laugh at the scene, apparently it was really hard to choose the right kind of prosthetic for Thor.
It was definitely one of the more surreal aspects of preparing for this movie,” writer-directors John Francis Daley and Jonathan Goldstein told Vulture about picking the right one.
“There was a hapless stand-in who first came in when we were looking at the possibilities, and he’d put it on and have to show all the different options to us. It was the opposite of funny because you felt so bad for this poor stand-in.”
Luckily when Chris himself was thrown into the mix, it became a little easier. “He was all for it, and ready to do it.” Finally, they narrowed it down to two penises: an eight-inch one, and a ten-inch one. And would you believe it, the eight-inch looked normal on Chris.