Just got the progasm - now have involuntaries!

I've been using the Helix and Eupho for six months. When I would tickle my nipples I would get a twitching in the prostate. I had assumed it wasn't actually the prostate that was twitching but muscles in the rectum causing the Aneros to move and make it feel like the prostate was twitching. Well, I recently ordered a Progasm ice red. Now when I tickle my nipples I get some serious involuntaries. I've found that if I slowly contract while tickling my nipples, I can locate a sweet spot where the involuntaries start firing up. The Helix and Eupho both cause the twitching but the Progasm causes more than a subtle twitch. I hope I'm on the right track.