-Sperm contains the most important nutrients (zinc, etc) and the production of semen is given top priority in the body.
-After ejaculation testosterone levels rise, but so do prolactin and oxytocin (feel good hormone).
-All of which contribute to an increase in alpha 5-reductase activity.
-More DHT production, thus more hair loss.
-Anecdotal: Currently on nofap 120+ days. Experience little to no shedding whatsoever. Everytime I would masturbate back in the day my scalp would turn hot and itchy. May just be placebo.
-Some people are more prone to hairloss than others. Cutting off masturbation will delay the inevitable, and when it comes to hairloss, that is all we need.
-Google stuff like this, it is all over the internet.
Okay: Let's assume everything I wrote about is pseudoscience.
-Even if it isn't proven, doesn't mean you should knock it off. If you're 19 and still watching p*rn and jerking off everyday, I wouldn't call you my son if I was your father.