It is an http:// .flv video stream from RedTube.
RedTube.com: How to download free flash xxx/porno/sex videos from RedTube (http .flv)

I haven't really checked any other videos, but if you have problems recording them, try Replay Media Catcher. It can capture/rip/download RTMP and HTTP videos from flash players, so it supports the majority of online video web-sites.

How to record/download/capture/save Macromedia/Adobe Flash .FLV video HTTP stream from embedded player
FLV players: Playing captured .FLV videos
FLV converters: Converting .FLV videos


How to record/capture/rip/download/save free adult/xxx/porn video streams from web sites like RedTube with Replay Media Catcher (video tutorial)