In some cases, "Torture" is considered "Play". The testicles are simply tugged on or stretched out.
Most men find handling, stroking and squeezing gently is a pleasurable sensation. Some enjoy using ball stretchers to achieve a longer sac.
Mistress: Now GUY! I told you I wouldn't stroke you until I had this nice leather shoe lace all tied around your cock and hang your nasty stinky combat boot off the end of your wee little pecker.
CBT guy: Oh Madam! You do so know how to tease me and make me hard.
Mistress: Stop that, you're making me wet and you know that must makes me want to hang weights off your ball sac.
CBT guy: Oh Mistress! sighing and moaning
CBT guy: sqeak! You are really gonna hang that 3 lb weight off my balls?! EEK!
Mistress: Shut Up! Or I'll get the 5 lb weight.
CBT guy: Yes, Mistress!
Mistress: Yes What?! Get the 5 lb weight! Or are you going to shut up?!
CBT guy: ...
Mistress: Smart guy!