The letter has been declared by The Economist as the letter of the month, and we must say they do deserve that. A senior Dutch-Italian couple wrote to The Economist magazine asking them to explain what ‘MILF’ was in their latest story on porn-trends world-wide. The best part of the letter though, is a sharp, snide remark on Google.

The letter which was posted on the magazine's Facebook page was in reference to a story on how the internet blew the porn industry’s business model apart.

The letter from the couple, while saying that they had "considerable international sex experience" added that they had no idea what the term 'milf' is "referring to or what this practice could be."

In good sport, they also added that "it is never too late to learn something new and enjoyable...and we are too old to accept to feel ourselves ignorant on these issues."

The Economist had traced the growth of the porn industry and also reported how things changed with the advent of the internet:

To attract customers, sites started to give away “teasers”. Amateur pictures—and not a few pirated ones—joined the free commercial content. Soon it was all being aggregated by “list sites” and “thumbnail galleries”, essentially collections of links. As the internet got faster, videos replaced pictures. Then came the tubes, which made their thousands of clips searchable. That porn is an industry where raw market forces reign helped them lay siege to the established producers: when anything goes, everything is tried, and quickly copied if it turns out to work/

The couple also added: "Needles to say, we did not want to google the term 'milf' in order not to be inundated with silly and unnecessary porn messages until the end of our day."