Yes, of course I've heard it. Masturbation in the downward position is very bad and risky. I have never in my life masturbated that way. Be careful how you masturbate, and preferably, masturbate very occasionally, in an upward position and be careful.
Relax. No matter how much PMO you do, your libido will return over the weeks thanks to abstinence.
I have been doing PMO for years and years, yet only 40 days of NOFAP makes my libido come back, even this phenomenon has happened to me for over a decade. So don't worry no matter how much PMO may be the case, the libido comes back thanks to the reboot. From my experience it has been like that. I have tried NOFAP thousands and thousands of times and my libido with only 40 days is back.
Today, I have libido, and I try to keep it in moderation with the sex, the masturbation or, the porn use. Actually, I use porn every 11 months or 8 months. Sometimes I going without porn for many many more time.
Thanks. I hope you're right. My dick is literally shriveled small, even before starting an abstinence period. I just hope that it was from too much PMO.