The Spanish have a greater awareness of the history of the Church and it's relationship to Cybele and Her priestesses, many of whom were gallae or transsexual women. Commenters at Questioning lack this piece of the puzzle so would be unaware of the further thumbing of the nose at the Catholic Church this calender represents. The only intact ancient statues of Cybele on public display I am aware of are in the square in Madrid and in the garden of Casio Pio IV in the heart of the Vatican which is the restored (by Pius IV) Phrygianum (convent home) of the Roman Cybelines.
That said, having viewed all the pics I, personally, found nothing controversial at all about the images themselves, all done very well and requiring a knowledge that the models have trans histories in order to make a controversy. In the ancient world, sacred sex with a transsexual priestess was considered a degree more sacred because of her nature. These images are powerful statements with multiple subtexts as well as beautiful.