You ever ejaculate to a porno and think "what the fuck am I doing?". Or after you finish feel shame or guilt? I know I have.
Back in the day when I was stressed, I would watch porn. When you watch porn or even look at a nude photograph you send a signal to your brain to release dopamine. Why is this you ask? well your body thinks that you are actually having sex with this girl or guy. So when your going video to video looking for that perfect girl or guy your body is releasing so much dopamine. This can be bad because when you are getting so much dopamine released, your day to day life is not going to be rewarding. If you're feeling depressed, I recommend you quit porn for a while and see how you feel.