When I was looking around I found this series in 9 parts which I find extraordinarily arousing:
My flatmate and his woman...
http://de.youtube.com/watch?v=T1HBh2brx2s
I also came across this one:
Geile Nachbarin (horny neighbor)
http://de.youtube.com/watch?v=F0gvAWblA7A
and this one on a cruise:
http://www.youtube.com/watch?v=aDmX9TXKqr0
Hope it hasn't been posted before!