The scene was when Crassus (Laurence Olivier who was rumored to have been a bisexual and involved in an affair with actor Danny Kaye) attempts to seduce his slave, Antoninus (Tony Curtis).
It's a interesting conversation regarding the eating of snails and the eating of oysters. But I think folk knew what was going on.
That's why the scene was cut. It was later added to the 1991 dvd release:
When the film was restored (two years after Olivier's death), the original dialogue recording of this scene was missing; it had to be re-dubbed. Tony Curtis, by then 66, was able to re-record his part, but Crassus' voice was an impersonation of Olivier by the actor Anthony Hopkins. A talented mimic, he had been a protege of Olivier during his days as the National Theatre's Artistic Director and knew his voice well.
Here is the scene:
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