Romantic letter writing is often difficult for us to write romantic love letters our closest loved ones. Are you trying to boost the passion in your relationship? Only romantic messages can pump up that intimacy. Keep reading -- we polled 100 of the top experts in the field, and asked them to share their secrets on how to write those top notch romantic love letters. And surprisingly, it's a lot easier than you might think!

Be yourself: the number one tip from sex experts was to focus on just being yourself in your romantic letters. Express how you truly feel to your partner in your own "voice". Don't fall prey to schmaltz or try to play a "role". Remember, you are the one your spouse fell in love with, and therefore you are the one he or she truly wants to hear from.

Be specific: most of our top sex experts urged people who want to learn how to write romantic love letters to focus on specifics in their writings. Instead of expressing vague sentimental thoughts, say exactly how you feel and what you want to do with your partner, using concrete details.

Be passionate: many people have trouble truly expressing their passion for another human being. One prominent sex expert explains it this way: "most of us are trained to be repressed. We are so scared to show our true, burning, passion, because it is not accepted in our society." When writing a romantic letter, it is time to banish all repression, shame, and fear.

Be erotic: remember that true, passionate, love is not just all about roses and chocolates and teddy bears. The passion and desire two people can share is one of the most beautiful things in the world. So don't censor yourself when you write romantic love letters -- instead, try to reach down into your pit of burning desire and let it flow onto the page.

Include if you can in your envelope an item or two signifying passion, romance and happy times together. Perhaps a lipstick kiss, rose petals, a fragrance, a photograph of a special occasion together, or a heart-shaped candy will remind your loved one of romantic memories, inspire ideas, and spark passion.