Hmm...
The average size of an Arab stallion's member combined with the speed of an average household sewing machine...
let me calculate this...
Say an average household sewing machine's electric motor does some 1500 rpm...
and the average member of an arab Stallion weighs about 3 pounds ...
Now... think about having 3 pounds doing 1500 strokes and downstrokes per minute. Provided, the member is a foot long, that would give you a displacement of about 10 inches (since during an average stroke, the member wouldn't go all the way in).
A minute has 60 seconds... 1500 RPM would give you 25 strokes and downstrokes per second. Since coupling involves by nature a one-diretional, thrusting motion, your member would have to cover the 10 inches in a mere 0,02 seconds.
After 0,02 seconds, you would have moved 10 inches (25 cm), resulting in a terminal velocity of 50 km/h. Your member would experience an average acceleration of 694 m/s(2) during one stroke.
Remember, you are doing this 50 times per second. The gravitational force is defined as 1 G = 9,81 m/s(2).
All this provided, the forces you would out on your dick would be F = m*a
resulting in 1041 N, giving you a torque of
312 nm during intercourse. Better than most mid-sized cars.
Now there lies the problem: Your average motorblock is constructed from cast machinery grade steel. Your body alas, is comprised of over 80 percent fluids. Considering the inherent inertia, your dick would rupture and blow apart if you really put it through that stress.
So... I hope your gf likes
gore...
At least, don't go for your normal drugstore lubricant... use 0W30 full synthetic motor oil, if you don't wan't to overheat her...
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Sorry guys... I just couldn't resist calculating this through with some basic physics formulas
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BWAHAHAHAHAHAHAHAHAHAHA!