There is also smoothing in surface modeling tab which haves Breaks option. Using that you can select lines where you dont want so much bending (or rounding) to occur. You dont have to hold down shift for more than 1 line selection while Breaks are active, just click on lines. Or you can drag a box over whole model to select all lines and if you wish, exclude some of the areas you want to be more rounded by clicking on lines to deselect them.
Also smooth from surface modeling haves tension regulation and partial smoothing for some of the smoothing types. Partial smoothing offers option to select just parts (surfaces) of the model you want to smooth and everything that is not selected will not get smoothed (divided).
Click thumbnail to see full-size image