Food Porn is tempting. Food Porn is lenient. Food Porn is often prohibited! It makes your mouth water at first sight. There is often a hint of guilt implied in wanting it. Food Porn is for the foods you wish you were eating. You're more likely to get excited looking at a delicious chocolate dessert than a stalk of celery (but not always!). The best way to explain Food Porn is to see it.
P.S. Don't worry – we go further and show healthy, yummy foods too.