While I was erect the other day and looking at porn, I squeezed my penis and sort of masturbated the shaft all the way up to the head without touching it so as not to reach ejaculation, later in the day I noticed my cock was a lot thicker so I decided to measure, and sure enough I'd gained at least a 1/4 inch in girth in the first session. I'll post updates as I continue this new exercise and let you all know if my gain was only temporary. Please fill me in if anybody else has tried this and the results they found!