Myth #1: A woman's hormones are the main driver of her desire.

Many people assume that if a woman rarely wants sex, it means there's something wrong with her libido—and that she needs medical treatment. "The biggest misconception is that low sexual desire is all hormonal," says Juan J. Remos, a doctor with the Miami Institute for Age Management and Intervention. "But libido is a lot more complex than that, and overlaps with every sphere of human experience, including vascular health, mental health, nutrition, body image, stress level, and the quality of your relationship generally." Taking medications like testosterone patches to boost your desire isn't going to work unless the problem is physiological—and low sexual desire in women is rarely the result of physiological causes. In most cases, the problem stems from how she feels about herself, her partner, and her relationship. So when a woman has low sexual desire, the first thing to do is to assess the relationship itself, and how it can be improved.

Myth #2: Emotional intimacy guarantees a good sex life.

"We've all been brainwashed to think emotional intimacy is the best thing," says Kathryn Hall, author of Reclaiming Your Sexual Self. "But lots of couples get really emotionally intimate and their sex life tanks anyway." For many couples, emotional intimacy makes them feel like they're best friends—but doesn't feed their desire. The solution is to give yourself permission to be playful, to take risks, to be less emotionally intimate and more sexy. For many people, a far greater turn-on than emotional intimacy is feeling desired. "The secret is to forget about doing what you think is normal, and instead embrace whatever it is that makes you feel fun and young and sexy," says Hall. "Feeling desired is a prelude to feeling desire."

Myth #3: If your partner wants sex but you don't, you can express your love in other ways.

We tend to think that people should be able to choose whether they want sex in a relationship—and we assume that if one partner doesn't want sex, the other partner should accept it and remain monogamous without complaint. "This is impractical, unfair, and unworkable, and often leads to infidelity," says Michelle Weiner-Davis, author of The Sex-Starved Marriage: A Couple's Guide To Boosting Their Marriage Libido. When people get married, they naturally have to come to compromises in many aspects of their lives—where to live, whether to have kids, and whose career to focus on, she explains. But they often neglect to talk about what their sexual relationship is going to be like, how often they're going to have sex, and how high the quality of their sex will be. "That's an oversight because sex is the tie that binds," says Weiner-Davis. "To think that only one person should be in charge of that decision is very short-sighted."

People have different "love languages," she explains. For some people, touch makes them feel loved; for others it's meaningful conversations, or how much time you spend together. "But if you're married to someone whose love language is touch, you can buy them expensive gifts or take them on vacations or say I love you until the cows come home, but it won't matter because it won't mean love," says Weiner Davis. "In good relationships, partners try to figure out each other's love language and speak it—even if it's different from their own. Good relationships are built on mutual caretaking."