I have encountered the same problem too, here is how I have reconciled this problem to avoid disappointment in my measurements.
The physiological/ chemical variables involved in getting an erection, I am convinced are responsible for this variation in size. Some of these variables could be -
- "Mechanical arousal" versus "really turned on arousal” determined by levels of hormones circulating, particularly Prostaglandin and Testosterone.
- The body flexes during the day as well, apparently it can vary measurably between getting up in the morning and say afternoon. My best measured erections have always been about mid-afternoon.
- Ambient conditions - hot weather equals bigger erections due to vascular relaxation.
- Diet, medicine, stress, etc - it’s amazing how many things can alter our blood chemistry at any one given time thus quality of erection.
I think psychologically, if Penis Enlargement’ers can accept that they are working to a tolerance in their measurements, given these variable factors, it will give way to reasoning rather than disappointment.