Ménage à trois by French School

Here is a lady entertaining two gentleman or two gentlemen entertaining a lady, depending on your viewpoint, in an anonymous painting of the French School from the eighteenth century.  While being taken from the rear the lady contemplates the other man's erection.  The scene, especially given the man on the right's posture, is rather languid and gives the impression of the enjoyment of some hours of ongoing frolics, rather than a single frantic scene.  He is holding what looks like a pearl necklace.  Is it a gift, a reward or a payment?

Following the death of Louis XIV in 1715, France (or at least Paris - Louis XIV's palace of Versailles was closed down for a number of years ), under the regency of the Duc d'Orléans and then Louis XV, saw a period of libertarianism embodied by the rocaille style of art as practised by Watteau and Boucher.  There were less pompous historical scenes than in the previous baroque style and more frivolous subjects and nudes.

A graphic, fully-rendered, erotic painting such as this was unusual, with most sexual pictures being confined to engravings and drawings.  The artist doesn't have the talent of a Watteau, Boucher or, later, Fragonard but it is a nicely composed scene of  the sort of sexual frolic that the period became notorious for.