i actually would be happy to know my wife has some sexual desires. she has long been a very one dimensional lover. Nothing intersting ever happens and wont try anything other the conventional, her idea of conventional, sex. Not that i would feel it as a license for me personally to chase sex with others because i already do.
I don't really get it & I think you may have left out some important info in the point that you were trying to make.
You should probably have your wife join Lush and get her reading the stories. Best to ease her into the more tame categories first though.
Make a playful bet with her. Sex is the bet. If you win, she has to seduce you. See if that breaks the shell!