Okay, I'm going to put this as clear-cut as I can:

If you're not having the phone conversation, don't listen to it.

If it's not your room, stay out of it.

If it's not your computer, don't use it.

If it's not your money, don't worry about it.

If it's not your mail, don't open it.

If it's not your food, don't eat it.

If it's not your clothes, don't wear them.