Squeezing at the base of one's nuts to force them into a tight pouch of scrotum might be what some think of as stimulating but when I think of squeezing mine...or better still, having them squeezed for me, I want them squeezed enough so they're not round any more.
To illustrate what I mean, here's a link to a photo I posted on another thread here, several years ago.
http://www.femaledom.com/forum/attac...6&d=1097957477
Now THAT's having one be really squeezed! As you can see, it ain't round.
Having both of one's berries squeezed individually and simultaneously will get one's attention and if you can take enough of it hard enough and long enough, such squeezing can initiate an amazing climax.
The Geezer