If your goal is to create an index of the best MP4 videos under a certain theme (xxx), here are some best practices:
"index of" searches can find public-domain or educational MP4s, but most “best” results for popular movies/series are illegal and risky. Stick to legitimate sources for peace of mind.
Between 2010 and 2018, Google aggressively delisted "index of" directories containing adult content. As of 2025:
Also check file size: