this is 100% BS, i where in a relationship for 8 years, before this i watched porn literally everyday even 3+ times a day for 10 years, when i had sex first time i came fast as hell, i still watched some fucked up shit while in the relationship and guess what? my GF was super vanilla and i'm into freaky things but that didnt have any effect on my performance what so ever, if something it teached me control so i could give her orgasms before i came, restricting porn is just as stupid as restricting cannabis and no i dont smoke and have never done it lol.