The sense of humour of the Cinquecento was primitive, and in primitive humour prurience plays ever an important part, as is discernible in the literature and comedies of that age.

If you would appreciate this to the full, consider Burchard's details of the masks worn at Carnival by some merry-makers ("Venerunt ad plateam St.Petri larvati...habentes nasos lungos et grossos in forma priaporum") and you must realize that in Cesare's conduct in this matter there would have been nothing so very abnormal considered from the point of view of the Cinquecento, even though it were to approach the details given by Burchard.
But even so, you will hesitate before you accept the story of that saturnalia in its entirety, and before you believe that an old man of seventy, a priest and Christ's Vicar, was present with Cesare and his friends.

Burchard does not say that he himself was a witness of what he relates.

But the matter shall presently be further considered.
Meanwhile, let us pass to the second of these entries in the diary, and (a not unimportant detail) on the very next page of it, under the date of November 11.

In this it is related that certain peasants entered Rome by the Viridarian Gate, driving two mares laden with timber; that, in crossing the Square of St.Peter's, some servants of the Pope's ran out and cut the cords so that the timber was loosened and the beasts relieved of their burden; they were then led to a courtyard within the precincts of the palace, where four stallions were loosed upon them.
"Ascenderunt equas et coierunt cum eis et eas graviter pistarunt et leserunt," whilst the Pope at a window above the doorway of the Palace, with Madonna Lucrezia, witnessed with great laughter and delight, the show which it is suggested was specially provided for their amusement.
The improbabilities of the saturnalia of the fifty courtesans pale before the almost utter impossibility of this narrative.