What is the religious ruling on a husband who asks his wife to apply what he watches in pornographic films? And is everything in those films permissible or forbidden?

What your husband is doing is a great sin and an immense act of indecency (dayootha). The Prophet, peace and blessings be upon him, said: "A dayooth will not enter Paradise." His looking at the private parts of people is dangerous, and his allowing his wife to look is even more dangerous. There is no difference between seeing them in pictures, videos, or in reality. Allah Almighty has commanded lowering the gaze, and the Prophet, peace and blessings be upon him, forbade uncovering the thigh and looking at it. Therefore, it is not permissible for you to watch that, nor is it permissible for your husband, and he must remove these ugly films from the house.