Porn is the worst for this, everyone is so desensitized to it these days it effects dopamine response which in turn effects all sorts of things including general hapiness. Remember back in the day you would see page 3 of the star and think it was amazing? and now you try and find the weirdest stuff around because your brain has been reprogrammed, and it effects real relationships, men not being interested in having sex with their girls or wives, because mentally have alredy have their fill with millions of girls on the internet. Men are addicted to porn and most dont even realise.