Final answer:
Drive-reduction theory of motivation explains that a physiological need, such as hunger, creates a drive to act, which is less directly applicable to sexual desire due to its complex interplay of biological, social, and emotional factors.
Step-by-step explanation:
The drive-reduction theory of motivation suggests that primary needs create physiological deficiencies that result in psychological drive states aimed at reducing these deficiencies and returning to homeostasis. Hunger, for example, arises as a direct physiological response to low blood sugar, which creates a drive to eat. This theory applies neatly to hunger because there's a clear and direct physiological need that triggers a motivation to eat in order to restore the body's balance. In contrast to hunger, sexual desire doesn't always stem from a straightforward physiological need. While the biological components such as hormones do play a role in sexual motivation, human sexual behavior is influenced by a more complex interplay of biological, social, and emotional factors. Sexual desire is often more about the psychological and emotional states and less about a direct response to a physiological deficiency as seen with hunger.