And one of the most common issues buying the largest size available even when you don't have a 12" as thick as drink can tool.
While it's been 16-17 years since I had a sexed class i still remember the girl who came and told us to buy regular or even ("small") since it was still when I was 14-15 then she took a the smallest size Durex and rolled it over a 2 liter soda bottle and said unless you are bigger don't buy magnum super XL.