Oh well, it’s true that we still know so very little of our bodies true cababilities. I’d still love to hear from these two of our experts, if they’d be willing to chime in. :)
I’m doing some research in a related area. Let me finish that and I’ll post something here.
I will say now that 2 mm to 6 mm changes are easily attributable to errors in measuring. It’s a relatively small change that simply holding the ruler differently, being more or less erect than the last time, or the angle of the penis/ruler to the body can account for measurement differences in this range. A believer in hypnosis will attribute the gains to that rather than the more obvious reason of incorrect measuring.