My wife loves when I use my good creams and lather her up with a boar bristle brush.
I've shaved her with my straights before but it is hard to find a good shaving position for her to stay still and not get cut. A while back I scored a Fatboy '61 and I like it but I have my straights and if I am in a hurry I use my shavette or my Rolls.
She usually uses a Venus razor but at 3 bucks a head the cartridges are expensive. I think I have her sold on DE shaving and she can use my Fatboy and I have a source in town for Seven O'Clock yellows for 2 dollars per 5 blades = $.40 per blade. Not bad, but for leg shaving the Wal-mart Wilkies will probably work and I can get those for less than $.30 per blade.
She also said it feels less irritating and leaves her legs very soft and shiny and smooth... ahem, you know what I mean.