Нашёл милый сайтик, подводящий научные исследования под нофапон:

Are you a heavy porn user who, during lovemaking, cannot consistently produce/sustain an erection or penetrate a real partner, feel much sensation, or climax (without difficulty)?
Growing evidence suggests that the problem is indeed in your head, not your penis, but that it is primarily physical. Specifically, overstimulation has produced plastic changes in your brain, which make you less responsive to pleasure—and yet hyper-responsive to Internet porn.

http://yourbrainonporn.com/why-do-i-find-porn-more-exciting-partner