Have it tonight: Even if you went on your honeymoon 12 years ago, or don't plan on going on one for another 12 years, you can create the spark by triggering her reward system. Try these tricks:

In the morning, use a ballpoint pen to write a sexy note somewhere on her body. Try the top of her thigh (prime real estate, with minimum exposure to coworkers). "Women are turned on by words," Fisher says. Start with "I," end with "you," and use the verb of your choice in between. Giving her 9 or 10 hours to see, think about, and fantasize about your note starts the percolation process.