According to research on sexuality in marriage,

Question

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Research suggests that couples often engage in a "discourse of difference," meaning they may have different levels of desire or preference for sexual activities, and communication about these differences is important for maintaining sexual satisfaction in the relationship. Option A is false, as some studies have found a decrease in sexual frequency over time in even high-quality marriages. Option C may be true for some couples, but there is no evidence to support it being a general trend. Option D is false, as sexual behavior can also serve other purposes such as intimacy, connection, or stress relief.

According to Research on Sexuality in Marriage