Here's an edit of a sociologist talking about her research into the unspoken pact between men to not hit each other in the balls (I culled the obnoxious podcast dude interviewing her as much as I could.)
She put out an initial article in 2015:
https://rampages.us/socy101croteau20...n-the-balls-2/
And then a follow-up 2 years later about the DMs she'd gotten from guys about it:
https://rampages.us/socy101croteau20...urprising-way/
Kind of surprising, given that she's a sexologist, that she didn't recognize that most of the dudes reaching out to her probably had a bb kink--but I guess her naivete helps make for some good sound bites.