I want to clarify, I am talking about databases of information on pornstars and the scenes they have done, not search functions on "tube sites" that stream the actual scenes.
+1 to Data18.com. It seems to have some good info -- I can put in Gianna Michaels and Johnny Sins and see they did a scene together for Brazzers.
The best search engine I've ever seen is Search Extreme: The Joy of Search
, but they stopped updating in 2008. But their search engine and database were impressive, because it covered both pornstars and scenes -- you could search for scenes with Gianna Michaels and Lexington Steele that includes titfucking and the cumshot is on her tits.
I'd like to find a comprehensive search engine for pornstars based on their measurements -- be able to find redheads with natural DD's and taller than 5'8", etc.