At the end of the day you were just watching and sending porn. Which is something pretty much everyone does everyday. There's much worse things you could have done. (Gestures broadly at everything).

Take comfort in the fact that "bad" people don't worry about their actions. The fact you are worrying means you are ethical. We should learn from things that feel like that aren't who we want to be. Accept that we have the capacity to do that and vow to change it.