"Twist and shout"

Yes - that's what it is called - the ball squeeze... You, grab and twist - he'll most likely shout (you get the picture)!
And this is by no means a "ladies only" technique. If you've got the balls for it (sorry, bad pun...) also guys have used this attention grabber (another bad pun...).

Anyway, here are a couple of practical applications:

South Africa -- A woman told police he had attacked at about 4:30 p.m. Monday in her field between two villages near the Swaziland border in Mpumalanga.

The 53-year-old villager was busy weeding her field when a man appeared and allegedly ordered her to go undress under a nearby tree.

The woman refused and the man threatened to stone her and then physically dragged her to the tree. The two fell to the ground and struggled, until the woman was able to get on top of him and grab his testicles.

When the man surrendered, she ran for help.

Ohio -- Police in Warren said a man kidnapped a 32-year-old woman at 6:15 p.m. Thursday - then attempted to sexually assault her.

According to police reports, the woman parked toward the rear of the parking lot at the main library to drop off books. She told police her van was left unlocked while she ran inside the library (great idea...).

When she got back into the van, a man placed a knife to the woman's side and forced her to drive to Packard Park. The perpetrator forced the woman to the floor of the van and began cutting off her clothes and undressing himself.

The woman was reportedly cut on her shoulder, arms and leg. She managed to escape the would-be rapist by grabbing his groin and twisting until he ran off.