How to not get caught watching porno?

I really want to watch porn right now but I am not sure if I will get caught. I run regular scans once a week and go incognito or private browsing but I want to make sure I will not get caught. I don't make it a regular thing, but I need something now. I am on a shared computer and I would like ways to not get caught, but unless there is no way I can be positive, then I won't watch it.