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Excessive ejaculation (whether through intercourse or masturbation) can lead to hair loss in some individuals who are already genetically susceptible to androgenic alopecia.
It is entirely possible that this excessive ejaculation (more than once a week) can excasperate mpb and the scalp inflammation (itching, bleeding, stinging, tingling, etc) that is associated with it.
In the past, the focus has been on mastubation only. This was the mistake. Its not the masturbation itself thats the problem, but rather excessive ejaculation, including intercourse.
Abstaining from masturbation or sex will not stop male pattern baldness. But excessive ejaculation could very well inflame the scalp even more. This could be counter productive if one is on treatments. The effect might possibly be diminished to an extent.
Over ejaculation leads to increased prolactin over time, so the result really shouldn't be surprising. This is not a thread about abstaining from masturbation. But rather a warning that over indulgence could make things a lot worse than they already are.
If you have hair loss and tingling, itchy scalp, its probably a good idea not to jerk off to porn every single day.