Have you ever tried playing with weights?
Some people really enjoy the feeling of them pulling on various parts of their body.
No, it doesn’t have to be painful or dangerous. You can use a very light amount of weight, all the way to as much as you can (safely) stand.
Here, My sub has a parachute around his balls. From which I’ve hung multiple stainless steel weights:
This isn’t painful for him; he enjoys the stretching sensation. However, when I couple it with painful blows or lashes to his groin, he’s in even more bliss. 😉