More touching further increases sensitivity, in a positive feedback loop that can build to a show-stopping involuntary eruption.
I always enjoyed edging when i was masturbating and used to have sessions that would last between 20-50 minutes,it would have taken me about 15-20 at least to get to the point of no return,unless i was furiously stretching my feet squeezing my butt and vigorously jerk my junk, usually my dick was erect at about 70%-85% i was never gatting too excited,and i had no conscious awareness in my genitals.
Still having trouble identifying the right muscles? Take rapid, rhythmic and shallow breaths through the nose.