Written by Yella Hewings-Martin, Ph. But how do you keep the spark alive? Sex is a key factor in most romantic relationships. But last week, a new study showed that 34 percent of women and 15 percent of men who had lived with their partner for at least 1 year had lost interest in sex. There are many factors that can affect sexual desire. Find out how much sex has the greatest effect on happiness, why some people lose interest, and what factors contribute to long-term sexual satisfaction. How much sex is enough? In a paperAmy Muise, Ph.
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