@Pip: Because it is Europe and they do not chop-off the foreskins of their newborn boys! This person is portraying an intact erect penis with foreskin.
Actually, while America does get the occasional crop circle, most crop circles happen in the UK. America generally gets a tiny fraction of circles compared the the UK, sometimes as few as only one or two reported circles a year.
The French have always been a sexually advanced society as compared to the rest of the world.