My employer has zero problem with me reading about porn at work, but looking at it is a different matter entirely.
If this is true, can you expand a bit?
I work for a bunch of cool adults. The porn industry is interesting and makes for fun lunch conversations with the team. My nose is not held to the grindstone all the time and it's accepted that I spend a certain amount of my time reading articles and such.
But having pornographic videos or images up on your screen where others can see is just unprofessional.