David and Susan have been married for 20 years. Both are less interested in sex than they were at the beginning of their marriage, and their sexual frequency has declined over this period of time. David and Susan's circumstances reflect what the text refers to as

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Habituation refers to the phenomenon where individuals become accustomed to a stimulus over time, leading to a decrease in their response to that stimulus. In the context of David and Susan's marriage, their decreased interest in sex and the decline in sexual frequency over time can be attributed to becoming habituated to each other sexually.

David and Susan Have Been Married for 20 Years