The subject is derived from Alexander Pope, Imitations of Horace, Book II, Epistle i, (1st edn 1735) lines 147-154, describing the luxury and excess of the Court of Charles II:
'Then Marble, soften'd into Life, grew warm,
And yielding Metal, flow'd to human form:
Lely on animated Canvas stole
The sleepy Eye, that spoke the melting soul.
No wonder then, when all was Love and sport,
The willing Muses were debauch'd at Court:
On each enervate string they taught the note
To pant, or tremble thro' an Eunuch's throat.'
It has been suggested that the model was Wilson's only sister, who lived with him in his early days in London and became attendant to Lady Sundon and later Lady of the Bedchamber to Queen Caroline.