Why watching porn is bad: It rewires the reward mechanisms (dopamine) and social interaction required for actual sex. This is particularly bad for young men who regularly develop erectile dysfunction (ED) when exposed to real sex after watching and controlling their orgasms. This ED can take up to a year for men who didn't watch porn under 25, and up to 3 years in men who watched porn through their early teens, to rectify after giving up watching porn in you.
Still photographs of porn are far less damaging than chopping and changing between live streaming porn.
Like everything - a little is OK - too much will cause problems. #NoFap