Give an overview of the types of physical changes that occur in early adulthood. Some types of physical changes that occur in early adulthood include a gradual decrease in one's maximum heart rate, respiratory capacity, and sensitivity to sound at high frequencies. Some other changes that occur include lens of the eye stiffening or becoming thick and fast-twitch muscles declining in size and amount. What did this Module say about differences in sexual behavior between married and unmarried couples? This Module references a general social survey indicating that married couples in the US on average have sexual intercourse 58 times a year. Based on these results, the myth about marriage and decreased sex is debunked as it indicates that married couples engage in sex more frequently than singles or unmarried couple
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