It's amazing how many videos of human sexual behavior you can find on the web. Try it; type in a few well-known keywords, and you'll have no trouble finding plenty.
I'll just leave you with this one.
More like this
I see a lot of metadata out there in the wild woolly world of repositories. Seriously, a lot. Thesis metadata, article metadata, learning-object metadata, image metadata, metadata about research data, lots of metadata.
The Bottleneck Years
Or, at least, I'm surprised that this earlier implemented solution has not been mentioned in all the discussion about NSA spying.
Go to http://www.slideworld.org, type in a keyword, and it will do a search of slideshows that contain that word.