Positive: Learn how it feels to orgasm, the feelings leading up to it and ways to control it. Learning what feels good for myself. Being in touch with my body’s pleasure centers.
Negative: Somewhat reliant on pornography in the past. Anxiety that I will not orgasm or get an erection during a real sexual encounter due to not being as relaxed.
Positive is that it releases sexual energy so I’m not horny all the time. Negative is that I believe I over did it in my teens and early 20s. Now 20 years later I rarely watch porn but I still believe it is affecting me after all this time.
I think that a lot of my problems with erection stem from the fact that I masturbated a lot while being stressed out and obsessed with having the firmest erection possible during a certain period of my teenage years, thus rewiring my neural pathways to associate every sexual act with this and slowly falling into a pathological vicious circle. It might’ve also influenced my relationship to sex because most of the time I don’t like handjobs, and I only like certain ways of doing blowjobs, maybe working on being less dependant on specific types of stimulations can help me.
It’s a release, I wouldn’t otherwise get. But, it’s not as enjoyable as sex with a partner would be.
Obviously orgasms are a positive. Negatives include: my wonder for why this can’t easily occur during sex, guilt that I am not giving this experience to my partner for her to help me, and a sort of anxiety
It helps me to relieve stress but it can also make sex more difficult
I feel like I’m training myself to do something that my partner can’t duplicate.
Positive - feeling good in the moment, pleasure, exploring fantasies negative - become too accustomed to certain type of arousal and rely on visual stimulation.
I definitely have that death grip that’s been mentioned 
The positive is not only orgasm and pleasurable sensations, but also the confirmation and evidence that I can get, and keep strong erections. It is also almost always a very enjoyable time.
The negatives can come afterwards, where it makes me question why it is so easy during masturbation. And I also wonder if my masturbation and porn habits are a cause for the ED… Leading to stress that every time I masturbate/watch porn, I’m prolonging this issue for some short term pleasure.
The negatives are the routin of the whole thing and what is necessary to get me aroused. It has helped to only nasturbate with my thoughts
Of course the positive is getting a nice release and relieves stress. Negative effects is that I end up needing a hard grip and very fast pace in order to orgasm so it makes it hard to do during regular sex. I usually have to masturbate a little during sex to get myself close and then can finish while having sex. Not the most ideal.
it feels great and helps me relax. It has created a dependence on porn though and I can see how I have trained myself to respond to my own touch.
It’s a lot of fun and u don’t have to be self aware at all but it makes me numbed to sex.
Positive proves to me how hard I can get.
Negative confusion on why I can’t get it up so consistently with partner.
Positive is the topical, ejeculation and while i watch porn is more releasing sex I’ve had.
Very enjoyable, and helps me sleep.
At first it was a time where I could relax and release. (Position)
Eventually, it became just a routine and altered my desire for actual sex as well as give me some body dismorphia (via porn)(Negative)
Positive - good release of stress
Negative - over dependence on external stimulation
The obvious of course. However it has left with me with an expectation of myself that I feel I am not fulfilling. Since being in this relationship I have stopped masterbuating regularly, even when on my own, in my own house. Makes me worry that I am losing my libido or something. And it has probably trained me to be stimulated in very specific ways. Even when I find something really hot with my girlfriend, it might not necessarily lead to erection. Which is heartbreaking.