And that video's been around for a LOOOOOOONNNNNNGGGGG ass time.
Like FLBobcat said, It's from injections. Nobody's balls would look like that normally unless they have a serious medical condition or Saline/enlargement hobby.
It can't be that pleasurable because he isn't even erect.
I'd say more urine control than ejaculate control.
If you had to categorize this, it would be under Saline Injections or Extreme Fetish pumping. (Not to mention fake)