This clip I recognize. I don't know about the entire video, but samples can be found at: http://thisvid.com/videos/mud-2/ and at: http://thisvid.com/videos/mud-fun/
Please let me know if you find out, thanks!
I'm sorry that I don't remember the specific site, but it's from a longer video, a clip of which can be found at:
http://www.xvideos.com/video6411038/vintage_gold_01_german_armyfuck#