Answer:
The correct answer is - Frotteuristic disorder.
Explanation:
Frotteurism or frotteuristic disorder is one of the sexually arousing disorders. It is characterized by touching or rubbing one's private parts or genitals up to the other person with or without their consent to get sexual satisfaction.
Robert's condition is similar to the frotteuristic disorder as he also gets satisfaction in rubbing his genitals against strangers and putting inside the crowded situations.
Thus, the correct answer is - frotteuristic disorder.