Om Swami
How can I avoid wrong thoughts by being careful about what I watch?
Guard what you take in through the senses
What you take in through the senses stays with you for a long time and settles in the mind. So before watching anything indecent, ask what you will do by seeing it, since it brings neither Ishwar nor a happiness that lasts.
So before watching any indecent scene, anything that will bring you neither God nor lasting happiness, think first.