The inside of the cards is encrusted with erotic allurements which would not be respectful to be displayed in public. But Robert Watts thought of a way to enjoy these pleasures discreetly: the texts printed on the backs of the cards look like classical concert programs. Therefore, even if you were enjoying these cards in public, people would think you are spending your free time preparing to listen to classical music performed by the artists from America.
An interesting detail: one of the participants of this imaginary concert was the chimpanzee Congo, who is mentioned to play the quartet.
Congo entered the ranks of Fluxus artists because of her interest in painting abstract paintings, but who knows, maybe over time she also developed the skills of a classical instrument.

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Robert Watts - Playing cards