A man who derives excitement from indecent exposure is likely diagnosed with which disorder?

The described behavior of deriving excitement from indecent exposure aligns with exhibitionistic disorder, as it specifically involves exposing one's genitals to an unsuspecting person for sexual gratification. This disorder is characterized by recurrent and intense sexual arousal from the act of exposure, which must occur over a period of at least six months and lead to significant distress or impairment in social, occupational, or other important areas of functioning.

In contrast, the other disorders listed involve different behaviors: frotteuristic disorder involves gaining sexual gratification from touching or rubbing against a nonconsenting person; sexual masochism disorder entails being aroused by the act of being humiliated or hurt; and voyeuristic disorder is characterized by the practice of observing an unsuspecting person who is naked or engaging in sexual activity for sexual excitement. Each of these disorders has distinct features that do not include the specific act of indecent exposure. Therefore, the identification of exhibitionistic disorder is accurate based on the man's behavior.