pas de deux

pas de deux, kaksintanssi puhekieltä A dance performed by two dancers.
1845, w:Charles Dickens|Charles Dickens, Pictures From Italy, ch. 4:

The way in which they dance . . . the final passion of a pas-de-deux; and the going off with a bound!—I shall never see a real ballet, with a composed countenance again.

The Russian was a beautiful youth, like a sun-god with his flying yellow locks and glorious symmetry of body, and the pas de deux between him and Magda was a thing to marvel at.

But at the end of the show, as two senior citizens are brought from the audience to dance together — first tentatively, then springing into a graceful acrobatic pas de deux — we realize that the human body's most sensuous organ is the head.