DaftSex
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DaftSex pulls in a large volume of amateur clips, and its homepage updates frequently enough that returning users tend to find new material quickly. Categories are functional rather than elaborate, which keeps the experience simple. Video quality varies by source, from phone-shot clips to decent HD.
The site runs with no account requirement, so you can browse and stream without any sign-up. The ad load is moderate for a free tube. It is worth checking if you find the big tubes have become too commercialised and want something that still feels more raw.