This site gives an error that you have to download an Active X plugin - this spreads a trojan:

From precisesecurity.com/blogs/2007/11/01/video-activex-object-error-now-in-macintosh/

Have you visited movie websites, particularly porn ones and encounters an error “Video ActiveX Object Error;” did it prompt you to download and install a file to be able to display the video? If you have installed the video codec called MacCodec then you may have been infected with OSX.RSPlug.A.

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I got this error when trying to access the videos, but I didn't download the "Active X Object"

I'd advise you all to do the same