redtube-dl
this is a simple link extractor for redtube.
just type
python redtube-dl.py (web link)
and it will start to extract the absolute video url.
python redtube-dl.py http://www.redtube.com/70191
It is only for those who are above 18.
By the way if you forget to give it a website url it will itself prompt you to write it.