Physical contact is also important. You don't need to jump on him right that very second -- though I bet he wouldn't mind that, either! -- Be a bit of a seductress. Use your hands to caress him, massage him, and just enjoy being close. Kissing works too, especially if it's been awhile since the two of you really kissed. If you're unsure how to begin, try remembering -- and talking about -- sweet or loving or romantic memories that the two of you share, such as when you first met or when you just began dating.
Remember that every relationship, no matter how successful, can always use a little something extra now and then. Keeping the spark with someone you love can sometimes take a bit of effort at times. The good news is that when you make the effort, you will find that it's well worth it. And that old gentle flame that you've enjoyed for years can turn into a roaring blaze before you know what's happening!