Final answer:
John's behavior is characteristic of exhibitionism, which involves exposing genitals to strangers without their consent.
Step-by-step explanation:
The behavior exhibited by John is characteristic of Exhibitionism. Exhibitionism is a paraphilic disorder where individuals derive sexual pleasure or gratification from exposing their genitals to others who have not consented to such exposure. It often involves exposing oneself to strangers in public places.