I thought she was ripping me off by pretending...
Since when is a female pretending anything during sex cause for a male to feel ripped off??
Trying to set up a train on a two and a half minute rotation are ya?
Me? naah, just applying the industrie's guidelines I happen to have stumbled upon during one of my, err, exploratory researches.
You see, just like cheap romance novels where a sex scene is mandatory every 3 or 4 pages with 1 1/2 pages of misunderstandings between the two leading characters and 1/2 page of the heroine having conflicting emotions leading to 1-2 pages of romance, which, in turn, results in said sex scenes, the length of each displayed position/variation in hetero-/bisexual porn movies is traditionally being determined by a very simple, but effective equation:
Total length of video / (# of scheduled positions/variations * male participants).
At least it was, until in the late 90s production companies noticed a decrease in sales (they blamed the advent of webcams) and reacted with an economisation in the human resources dept., leading to what industry insiders call the missionary era: cost-efficient, but deadly boring.
Sale figures plummeted, until some R&D assistant manager finally came up with the perfect solution: he added a supplementary value X to the equation with X being determined by the originality and eXoticism of the position/category in question (that is: the more original and exotic, the lower the value on a scale of 1-8). So the revised and widely accepted equation now is:
Total length of video /
[(# of scheduled positions/variations * male participants)] * X
Since payment of the actresses is calculated based on the equation rather than on the actual performance, and force fucking rating a 3 on the X-scale, you can clearly see how that actress has been cheated out of 2/3 of her proceeds, which, in turn, leads me to the assumption that what you watched was a) very old , or b) an amateur video.