Will Miss #215 - discretion

There are vending machines everywhere in Japan, but I've noticed that certain types of machines (e.g., condom machines, marital aids dispensers) are discretely placed while others are out in the open (e.g., rice, soda). They're either behind barriers or in places where there isn't much foot traffic. I can't say for sure, but I think the positioning as well as the fact that these types of items