Procopius’s Secret History is a pretty fantastic example of that kind of writing (though there’s more interest in the Empress’s sexual misadventures than the Emperor’s)

Frequently, she conceived, but as she employed every artifice immediately, a miscarriage was straightway effected. Often, even in the theater, in the sight of all the people, she removed her costume and stood nude in their midst, except for a girdle about the groin: not that she was abashed at revealing that, too, to the audience, but because there was a law against appearing altogether naked on the stage, without at least this much of a fig-leaf. Covered thus with a ribbon, she would sink down to the stage floor and recline on her back. Slaves to whom the duty was entrusted would then scatter grains of barley from above into the calyx of this passion flower, whence geese, trained for the purpose, would next pick the grains one by one with their bills and eat. When she rose, it was not with a blush, but she seemed rather to glory in the performance. For she was not only impudent herself, but endeavored to make everybody else as audacious. Often when she was alone with other actors, she would undress in their midst and arch her back provocatively, advertising like a peacock both to those who had experience of her and to those who had not yet had that privilege her trained suppleness.