Regular penis-root masturbation IELT up from 60s to 180s (3x)

Regular penis-root masturbation, a novel behavioral therapy in the treatment of primary premature ejaculation - PMC

Regular penis-root masturbation - After a 3-month PRM training, the median intravaginal ejaculatory latency time (IELT) increased from 60 s to 180 s

What do you think could be the method of action/effect in this study? They make guesses in the paper but I wonder if better opinions could be found here.

For me it sounds backwards, I have been trying to desensitize the head with masturbation and yes things have gone backwards! So my ideas are completely wrong.

I’d guess that the base of my shaft is about as sensitive than my glans, though in an entirely different way. Further up the shaft, even though it looks identical, sensation is much less.

Yep but either way, why would masturbating using only the base of the penis then make you last longer during vaginal intercourse. And not by a small amount, that result is higher than dapoxetine.