Aren't they both free sites? What do you have to pay for? I can't see any mention of bitcoin on there (but lol at paying for porn).
No. They are not free sites. If you want premium content, then you'll have to pay. For example, Premium membership in Pornhub costs as much as $119.95 per year, or $14.95 per month. A premium membership with YouPorn will cost you $20.00 per month, or $119.95 per year. There is also a 2-day trial on YouPorn. It costs $1.00. Premium members will be able to view copyrighted and HD videos, which are not available for the free users.