My Aneros autof**k is powered mostly by my breathing and somewhat by my anal musculature. Because of all this, it certain feels real GOOD!!! 😉 😀 😀
Thom./BigGlansDC
same experience here. At a certain point, I could govern my O's just by the rate and depth of my breathing. Depending on where I held my breath, it would land on X marks the spot and boom, then I would continue to breath in and increase the level of the O. amazing!