Remember to double check you closed all incognito windows. You know what I mean.
It is really so much safer to watch pr0n in incognito tabs?
Incognito mode is for keeping your browsing history "clean" on your end. So that if your friend or relative uses your computer, he/she does not stumble upon stuff you don't wont to see.
Somehow I never had an issue with that.
It's especially to prevent it from showing up in autocomplete. Imagine you tell your mother to look up a plane ticket on Priceline, she types "p" into the address bar, and all of a sudden 8 different porn videos show up as the top 8 autocomplete suggestions.
Now if she's polite she probably won't say anything and you'll never know. But...
I just never had a problem with my family or friends to see that I watch porn.