Татьяна Троянос - Секст, Эрик Тэппи - Тит.
...not the directors'. The Regie folks can only underscore or subdue the impression. Screenshots from Jean Pierre Ponnelle's opera film La Clemenza di Tito with Tatiana Troyanos as Sesto and Eric Tappy as Tito:
I'm really interested to know how the castrato singer Domenico Bedini, the first Sesto ever, interpreted this stuff. For now I've seen/known of 7 independent stagings of La Clemenza, and only ONE among them was totally free of any ambiguous moments (the Glyndebourne 1991 one with bedsheet togas). Well, the Zurich one was pretty unambiguous, too, but I don't think Mozart planned it this way. %)))