Really? Others have spoken about it often, not him.
Have times changed? The idea of a "kept" woman, the mistress, the side piece, whatever goes back to biblical times and likely well before, in almost every culture.
Lord Byron, a veritable jet setter of his day, sired more than 40 children each on a different woman throughout his partying in Europe. Abandoned them all. 18 year old Mary Shelley, whose husband Percy Bysshe and herself were among Byron's lovers, rebuked him in her novel Frankenstein, when the doctor abandons his creation. Such a complex novel, with its many themes, sub themes. Man playing god the creator. Fear of science. Social revolution.
The revered Naval hero Horatio Hornblower, was kept by a dowager duchess, who made his career possible. Gigolos were not an Italian invention. Neither were boy toys.