The word libido refers not only to the desire for sex, but also sexual thoughts, responsiveness, and willingness to engage in sexual activity. About 60 percent of women surveyed list stress or fatigue as contributing factors to low libido, while others cite dissatisfaction with personal appearance, their partner’s technique, or other relationship problems. Good sex in a caring relationship is good for you. Sexual activity fosters intimacy and closeness, and boosts antibodies that fight infection. Hormone levels increase with sex resulting in better sleep, improved intimacy, and lower stress. Sex can also lower blood pressure and promote cardiovascular health. So if low libido is a problem, talk to your healthcare provider about treatment options.