Unfortunately, self-gratification and p 0 r n are VERY hard on your adrenal glands. ANYTHING that stimulates adrenaline (epinephrine) can contribute to adrenal fatigue.
In the book “Adrenaline and Stress”, by Dr Archibald Hart, he list “anything that excites you” as a source of stress.
It is clearly increasing activity of the sympathetic side of the nervous system. Anything that does that...will lead to adrenal fatigue if experienced too often.
And you don’t have to go all the way to orgasm for it to be a problem. I’ve had set-backs (increased insomnia, anxiety), just from looking at p 0 r n for a few days. It is extremely stimulating.