I was watching some flash movies recently and one thing I noticed is it kept asking me to allow a cookie in FireFox. (I think it only happened because the streams where also trying to access my mic and camera.) While it didn’t bother me one bit to click allow I would guess that a horny surfer would get moody if he had to stop ‘handling business’ to click the allow button.

The movies did load very quickly and the video stream was pretty smooth. It wasn't as choppy as I've seen on some sites that use Java (or other methods) to stream their videos.