Final answer:
In S5E16 'Blood Drive' of The Office, it is implied Michael Scott and the Blood Drive nurse have a romantic encounter, but no clear scene of a restroom romp is shown.
Step-by-step explanation:
In the episode of The Office titled "Blood Drive" from season 5, episode 16, the couple that has a not-so-secret encounter in a public restroom are Michael Scott and his new love interest, the Blood Drive nurse. However, it is important to note that the supposed romp in a public restroom is actually a misunderstanding. Although Michael eagerly pursues a romantic connection, no explicit scene confirms such an encounter takes place.