that the reason that you have not been able to find cold pressed sesame oil is because sesame oil is not extracted by that method. According to Mountain Rose Herbs catalogue, cold pressing is "not a practical method for some vegetable oils, but highly regarded as the method of choice."
In expeller pressing, "only a small amount of heat is produced from friction generated by hydraulic presses, usually around 120-200 F. It makes a fine food grade oil and base for bodycare because of it's fairly undisturbed molecular state."
The oils we want to stay away from are refined & partially refined...Refinement methods can include flash fluctuation in temperature as high as 450F and winterization as low as -30F, deodorization, and bleaching.
Unrefined, cold pressed and expeller pressed are the way to go! :)