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And really, tube sites were just the logical next step after DVDs - just a different way to view the same pre-recorded media. The girls are almost exclusively all amateurs, so you won't have to worry about seeing the same old pornstars over and over. You're watching things as they happen, live, in real time.
Historians, for example, know that Shakespeare's play Henry V was not written before 1587 because Shakespeare's primary source for writing his play was the second edition of Raphael Holinshed's Chronicles, not published until 1587.