They will do that! It's never been on my bucket list, but my provider ladyfriend really got turned on by it. Nothing quite like having a 3 pound dumb bell suspended from your balls while getting a BBBJ. I was wearing the parachute device linked above. She said those things were really stretched down quite a ways and she loved the way it looked. Wearing of the parachute was for her.
As for the other stretcher....the type that wraps around the scrotum.... it makes the ball sac act as a sort of pendulum when having sex....I could really feel it swinging and slapping against her butt..... a really a nice sensation. And teabagging is taken to a new level..... and to my amazement, there's a stretcher just for that!
http://stockroom.com/Ballz-Gag-TM-Pa...ing-P3739.aspx