Just insert "nsfw" into the URL.
https://www.youtube.com/watch?v=1kcLFhGcVr0
-becomes-
https://www.nsfwyoutube.com/watch?v=1kcLFhGcVr0
That is not the location of Area 51. Groom Lake is north-west of Vegas.
I'm not entirely sure WTF you are talking about. Not I think it has something to do with this:
https://en.wikipedia.org/wiki/Sticky_and_blunt_ends
*But I think