There are many more restrictions than nude women. The Islamic definition of nudity is stricter than "Western society", so if you truly fear Allah’s punishment (which you should) you'd be very cautious. I'd guess the majority of YouTube videos contain some element of haraam. Other things that come to mind include music and bad language. Then there's the matter of listening to kuffars: while you don't have to abstain, you should be careful of being misguided.