A shopkeeper told police he overheard an American student and her Italian boyfriend, both suspects in the murder of a British student in Italy, planning a "wild sex" romp the day after police found 21-year-old Meredith Kercher's body, Sky News reported.

Amanda Knox, 20, and Raffaele Sollecito, 23, were shopping for lingerie in Rome Nov. 3 while hugging and kissing in an "exhibitionist" style, the newspaper reported, when they were overheard making their x-rated plans.

"I heard her as she was choosing the underwear — particularly the G-string — and as they were ready to pay, in front of the till, she whispered, 'Afterwards I'm going to take you home so we can have wild sex together,' " the shopkeeper reportedly told police, according to Sky News.

Click here to view the report from Sky News.

The shopkeeper told police that Knox and Sollecito spoke in English, but that he knew the language and could understand what the couple was saying, the Times of London reported.

When the couple paid for their items, Sollecito reportedly said to Knox, "You can put these on at home and we'll have wild sex," according to the Times of London.

Click here to view the report from the Times of London.

Kercher's body was discovered Nov. 2 in the apartment she and Knox shared in the central Italian city of Perugia. An autopsy concluded she likely died from a stab wound to her neck.