My girlfriend caught me watching porn and has freaked out saying she mustn't be enough for me if I have to watch it. But it's not like that. How do I help her understand?

As long as it hasn’t become an obsession, watching some porn is perfectly normal. Men and women have enjoyed looking at sexual images since the dawn of time, porn on the internet is simply the latest version. So calmly and lovingly inform your girlfriend that it’s perfectly normal for people to enjoy looking at sexual images, specially people with a more visual sexuality (as opposed to auditory or kinesthetic). Let her know that it keeps your sexual energy high so that you can direct even more passion to the one you love and desire most of all - her!