Answer:
The sarcophagus with a reclining couple reflects the influence of Egyptian culture. Although the sculpture is more expressive than Egyptian sculptures, the Etruscan sculpture uses a sarcophagus which is used in Egyptian funerary sculptures. The couple is reclining at a banquet together in the afterlife and they choose an Egyptian sarcophagus to be the furniture.
Explanation:
please note that I haven't confirmed whether it is right or wrong but this seems like the most likely inluence of another culture on the etruscan sculpture. the Etruscan sculpture is very characteristic of its time period with expressive gestures and relaxed faces. it portrays a banquet in the afterlife, but it is also different from greek banquets because the female seems to be the man's wife rather than a slave girl or prostitute.