There are ways you can satisfy his fetish without the danger of squeezing too hard or 'popping' them. If it's the pain he's after, you can cause that without squeezing at all... just use your imagination. You can also use things with a rough surface, like those defoliating bath gloves. - Blu
well yes many men have died from their wives angrily squeezing their sac. so don't do it till he is squealing in pain or passing out.
Squeezing is safe, don't worry. The news about the Chinese man killed during an argument with a woman who allegedly squeezed his testicles till death is classified as urban legend. There were similar stories coming from remote villages in Africa.