mental porn
the act of thinking pornographic thoughts
After watching so much lesbian porn Sally has having mental porn about every girl at the office.
Mental porn Star
Someone you've chosen to star in your own personal mental porn whether s/he is an actual porn star or just the cubicle dweller next to you.
I had chosen the hottie bar tender giving out free jello shots as my new mental porn star. I was having a series of fantastic scorgasms