Erotic Stories

In a way it's worse than images, because it really pulls you in. See Kli Yakar (28:39):

כלי יקר שמות פרק כח פסוק לט: והרהור עבירה קשה מן העבירה לפי שהמעשה עצמו אחר אשר כבר עשהו ישבע מעמל נפשו ונפשו קצה בו, אבל ההרהור דבק בו לעולם כאשר ידבק האזור אל מתני איש על כן בא לכפרה האבנט שהיה דבק בו כחגור.

From GYE Members

Negative Effects

• This past winter I discovered what to me was the most destructive form of porn. Stories. I found a site with literally thousands of stories of boys having relationships. Not just s*x, but friendship and romance. A video is just fun while you see it, and you can only watch it so many times before it gets boring. A story makes you think, and you get emotionally involved with the characters. The stories are serials, with a new chapter added evey few days. I would be checking 10 times a day to see what was new.  I found myself getting so caught up in them emotionally that it started to affect my daily life. #Gevura Shebyesod