Did Leonardo da Vinci paint two Mona Lisas? Where are they?

For the one below, art experts suggest that it contains touches indicating that Leonardo contributed to it.

Another version of the above exists, attributed to Salaj:

Obviously, the original Mona Lisa also inspired some cheeky versions of her.

What are the common formulas for improvising ornaments in bel canto singing?

Source: Chantilly, Musée Condé, France.

There is only one Mona Lisa, at the Louvre, fully credited to Leonardo. However, there are several Mona Lisa look-alikes from his studio, some of them quite saucy. The one most similar to the Louvre one is the Prado Mona Lisa, a copy made simultaneously in Leonardo's workshop while he painted the Mona Lisa, probably made by an apprentice(s):

Donna Nuda:

People’s Pharmacy: Did this OTC allergy medicine cause my excruciating knee pain? - OregonLive.com

Evidently there was a market for erotic paintings. The American art historian David Brown, curator of Italian Renaissance paintings at the National Gallery of Art in Washington, has suggested that da Vinci painted a saucy parody of the Mona Lisa for his patron Giuliano de Medici, and that the Salai version is a copy.

While overall similar, there are differences in the shape of the face, the background and other details.

Source: Louvre, Paris, France.

What do you do to make yourself sleep early?

Then there are the ‘meza nuda’ paintings from his workshop, often referred to as Monna Vannas.

La Joconde nue:

Source: St Petersburg. Hermitage, Russia.

Do you as a gay male enjoy the feeling of getting a penis in your anus?