What should I tell the salesman when I buy a condom for the first time?

Just go to the 24-hour unmanned sales office, or go to supermarkets such as Watsons. Generally, just buy a pack of chewing gum at the counter, and take a box by the way.

Or tell the shop assistant that I want a box of that, just click my finger. He doesn't know you, and he is used to being an intern. There is nothing to be embarrassed about.