If you prefer to stay in and cook, rather than to go out for romantic occasions, you might want to consider getting your date (and yes, it can still be a date if you're married to each other) involved in the kitchen with you if you don't already. The experience gives you more together time and makes the evening into an event, rather than just another meal. You can work together on any recipe from any cookbook, but Dinner Dates: A Cookbook for Couples Cooking Together gives you a good place to start because it is designed for this purpose. And if you tend to get a little protective of your space in the kitchen, it couldn't hurt to have the tasks divided up for you.
The "dates" are complete menus with both casual and more gourmet options. For example, "Fun with Fajitas" will get you margaritas, chicken and steak fajitas and ice cream sundaes, while the "Ultimate Valentine's Dinner" has french onion soup, filet mignon with herbed butter, and chocolate dipped strawberries and biscotti. There are a total of ten different dates, as well as information on prepping your kitchen and plenty of other foodie tips.