As a pharmaceutical sales representative, he should respect doctors and their professional terms and titles. Doctors were professional medical personnel. Their duty was to provide healthy and safe medical services. Therefore, they should use professional terms and polite titles to communicate with doctors. This would help build a relationship of trust and respect. If the gynecologist is older, you can use their title or professional field to address them, such as "chief doctor","expert","professor", etc. At the same time, when addressing doctors, they must respect their personal privacy and professional identity and avoid using overly intimate or offensive terms.