Best-Teens
Another interesting movie from Best-Teens.  From what's been gathered, these particular clips come from a study of sexual  behavior performed by either a major university or a corporate entity.  These videos are always a little weird, one because  the sex is almost clinical, and two because the girls who participate always seem more willing than their male counterparts.   This guy who may happen to be a professor or scientist of some sort, and like the university or company that did this particular study, preferred to remain annonymous.
Sexual trials are used for a myriad of reasons.  Besides standard endurance tests, many drug companies use human subjects to  test the side effects of drugs.  So, there is no telling how old this footage is.  Most likely this doesn't come from the  notorious Viagra trials, but it is obvious that this is university stuff.  Unless you are a scientist, it is hard to tell  what the study is trying to get out of the subjects.
You can tell university and corporate studies because the footage looks nothing like  production-style porno or camcorder, homemade, amateur stuff.  They are always done in a nice hotel.  They are always  over-explicit, much more explicit than XXX can be, because there are no time constraints or paid performers.  These are real  people and real reactions, and for some reason, the pursuit of science really turns these college girls into very willing and  very satisfied, corporate guinea pigs.
You can tell university and corporate studies because the footage looks nothing like  production-style porno or camcorder, homemade, amateur stuff.  They are always done in a nice hotel.  They are always  over-explicit, much more explicit than XXX can be, because there are no time constraints or paid performers.  These are real  people and real reactions, and for some reason, the pursuit of science really turns these college girls into very willing and  very satisfied, corporate guinea pigs.
Another way you can tell the institutional films is that they are heavily edited when  they arrive into the possession of pornographers like Best-Teens.  So, what you the consumer end up with is a 15 minute clip  of an encounter that could have lasted anywhere from a few hours to a month.  It is a well known fact that the male  enhancement drugs and erectile dysfunction drugs are tested the hardest, and usually warrent months of trials.  These tests  are usually done worldwide, so you end up with thousands of hours of footage testing effects in Europe, South East Asia,  India, South America, Japan, etc.  What do you have to do to get that job?  Best-Teens seems to have a knack of getting a  hold of these things. 
This clip could be from South East Asia and it could  also be from the United States.  I think it is from the United States.  The only reason I bring this up is because South East  Asian and Asian college girls in general are often used for these tests.  This may not really be a drug trial either.  It is  my opinion that this is a relatively routine sexual behavior study that is somehow testing arousal over an extended period of  time.
The only problem is that I have seen drug trials that look exactly like this.  I've also seen drug trials which are  one hundred times more explicit than this.  Birth control, boner pills, and enhancement products are some of raunciest out  there. 
I've only read about the Viagra trials in Asia. They are out there, somewhere.  I've read them described as "records of human sexuality."  Such a dry description can only mean one thing as evidenced by these clips here.
This is a very short snippet, which  is edited whenever the subjects start to talk about what is going on.  The only thing that would lead me to believe this is a  male enhancement or drug trial is that at some cuts you can see the girl is practically comatose.  She looks like she is  asleep.  Her motions are sluggish and multiorgasmic, and this is usually the result of drug enhanced sexual activity.  I  think at one point, he actually tells her to try to get some sleep.  The only sign of life she shows is her shallow breathing and deep groaning.
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