Watch this and Chill

Vietnam had a long tradition of anal sex which dated back to the courtesans at the court of Nguyen emperors who, each morning, prepared and anointed their arses for intercourse and were trained in the ways and arts of anal penetration.

When the French colonised Vietnam, they discovered two things. First, a long and slow arse fuck was ideally suited to the hot and humid conditions, and second, the tight Vietnamese arse was perfectly sized to give the European cock the most intense and satisfying sexual pleasure imaginable.

There isn’t a whole lot of sources to back this up, however, it’s well known that the colonialists regulated and maintained the sex trade, and no doubt anal sex was one of the offerings available.