"Stop watching porno because it steal your focus and your attention causing you not to concentrate on more important aspects of your life, leading you to masturbate more frequently."

Realy "good" advice.
1st if it would be so easy there wouldn't be any addicted people
2nd as it is nicely illustrated in the quote it is a vicious circle and they are not called that in vain
3rd acetylcholine, serotonin and dopamine are not sex hormones

and you could explain a bit more what for example what are other parasympathetic nervous functions