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

Donna Nuda:

Another version of the above exists, attributed to Salaj:

La Joconde nue:

Police take back statement dismissing hate crime in gay actor’s killing - The Washington Post

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

Source: Chantilly, Musée Condé, France.

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

New Non-Opioid Drug Offers Powerful Pain Relief Without the Dangerous Side Effects - SciTechDaily

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):

Source: St Petersburg. Hermitage, Russia.

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

Have you ever had sex with your mother-in-law? If so, how was it and did your wife ever find out?

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.

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

Source: Louvre, Paris, France.

Antarctic detector picks up signals that defy all known laws of particle physics - Interesting Engineering