As I was walking towards the Green Super Market that day, I suddenly remembered that my doctor friend's chamber was just across the street. I thought of dropping by for a quick visit.

There were several different types of doctors' chambers on the top floor, and I had to enter my friend's chamber to meet him. After exchanging pleasantries, I said to him,

'' You know, as I was coming here, I thought of something funny. I saw a dentist with braces on his teeth, and an eye doctor wearing glasses. It felt like whoever the doctor is for a particular ailment, they have the same problem. By the way, have you seen any interesting cases lately? ''

My friend remained silent with a dark expression on his face and handed me a card. As I took it from him, I saw that it read "Sexual Disease Specialist."

'' What's the matter? '' I asked, puzzled.

My friend looked down and whispered, '' I have an illness that only someone like me can understand. ''