ForumSexyPrime

Best/underrated Non porn Youtube channels with good content to sink some hours in?

Try with Sam O'Nella Academy (sadly he is on a hiatus right now, but you can check all his videos). If you're into Figures and Dioramas you can go with North of the Border, he makes all sort of nerdy stuff.

If you're into cars and like some decent to the point videos check out The Skid Factory well underated lads.

I would recommend for some deep topics and existential questions. If you are into tech/history, go visit vids, has great and witty machinig videos and does some really cool stuff with chemistry physics and other university and high education level stuff. If you are into podcasts, get some episodes, and thank me later

summoning salt has video essays about niche video game speedruns, I am not big on the content but the way it's presented somehow keeps you on the edge of your seat

If you like travelling Kurt Caz is a good channel, he goes to some pretty dangerous areas of certain countries on his own.

Atomic Shrimp, not least for his 'Weird Stuff in a Can' series

A little nerdy but I'm a big fan of TechMoan - a nice, mild-mannered and well-dressed English fella talks enthusiastically about old audio equipment. It's super relaxing.