Porndoe
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Porndoe runs a decent mix of amateur uploads and licensed studio content, with a search and tagging system that actually surfaces relevant results. The player handles HD streams well on both mobile and desktop, and the site loads quickly without excessive ad interruption for a free platform.
Some content requires a free account to view full length, but the open library is large enough to browse without registering. It is a reasonable middle ground if you want amateur content with a slightly more polished site experience than the rougher user-upload tubes.