No... you always use the actual focal length of the optics.
But the fact you have a multiplier (in reality, you are corpping down to the center of the 35mm frame) you will have to get farther away from your subject to get the same framing, and thus with the same lens on a digi body with a 1.5 factor compared to the same image shot with a full-frame film camera, assuming you position yourself to get the same framing, you will be 1) much farther from the subject with the digi body and thus 2) you will have greater DOF.
Thus you have the big problem with shooting digital glamor or any other genre where shallow DOF is desired... you need a full-frame sensor. The 1.5 multipliers suck. The only 2 cameras with full frame 35mm sensors suck. Some rumors are that the new Nikon is to be introduced with the summer olympics that has a full frame sensor, but I'll only believe it when I see it. Supposedly Nikonis coming out with something that is modular like a Fuji GSX but for 35mm (drool).
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