Hello! My husband went to Dr Michael Wong, who specialises in male fertility. He booked a consultation to have his sperm checked and to understand whether everything was healthy. Overall, it was a positive experience and he learned a lot from the session.
This is a useful article https://www.singhealth.com.sg/news/patient-care/infertility-can-be-a-mans-problem-too
I can ask around as my friend went for the consultation.