So last night as I started a no-Aneros session sitting in front of my computer while looking at porn, I noticed that I wasn't having much sensations. I also noticed that my conscious contractions had unknowingly shifted to PC muscles only. So just to experiment I tried contracting just my anal muscles, and was pleasantly surprised by very pleasurable sensations. So I worked with holding a quite firm anal contraction, and found that it kept the level of pleasurable sensations...