Just like Pagey said... keep things interesting. How did you try to impress the person when you started dating? Try some of those things again. Exciting dates. Different types of dates. Of course, sex, try some new things. Don't resort back to the same stuff you do all the time. It doesn't have to be crazy, just some different positions, or in a different location. Get your partner flowers or chocolates or something. Write a note, poem, letter, something romantic.