Final answer:
Stable sexual activity is typical in midlife, with longitudinal evidence indicating that this pattern persists rather than fluctuates. Trends also show that married couples engage in sexual activities more frequently than singles, and the median age of first marriage has risen for both genders.
Step-by-step explanation:
The question you're asking relates to trends in sexual activity during midlife. Longitudinal evidence suggests that stable sexual activity is far more typical than fluctuating in this stage of life. This means that as people reach midlife, their levels of sexual activity tend to remain relatively consistent rather than varying greatly over time.
With reference to the broader context of sexual attitudes and practices, it's important to note that these can vary among different groups. For instance, recent trends show that married couples tend to have sex more frequently than singles. To the point about age and perspectives, longitudinal research can clarify whether changes in attitudes, such as those towards same-sex marriage, are due to aging or belong to generational differences and social climate at the time of developing such attitudes.
Lastly, the median age of first marriage has increased for both men and women, reflecting changes in societal norms and personal priorities.