[alt text: a text-and-image meme. The text says: "When you're in the pit and you stop a hardcore kid from spin kicking you in the face". The image is a photo of two men facing each other. One man is older and muscular, and the other is younger and skinnier. Both men seem to be naked in a shower, and the younger man's leg is raised up such that his foot is up against the wall of the shower, next to the older man's head. The older man is holding the younger man's raised leg with his muscular arm. Upon further inspection, the photo seems to be a cropped frame from a gay male pornographic film.]
Same reason porn actors do anything, I'd guess. At some point, someone tried it, and that video sold well, so all the porn actors started copying that. Same reason why every other porn video is about stepsiblings and stepparents these days ๐
I would love to know who the originating actor is, though. I'm sure they said lots about why they did that.
Edit: okay I have a hypothesis. It's usually the receiving partner that makes the "it hurts" face. It's probably to appease the male audience, who craves validation that they have a big hog that is so big it hurts people.
excellent hypothesis. it feels like the fictional 5 monkeys experiment where conditions have changed but we maintain the behavior because that's just how it's done