The day after British student Meredith Kercher was killed, her housemate Amanda Knox and the latter's Italian boyfriend Raffaele Sollecito were spotted shopping for G-string and animatedly discussing sex.
Deposing at the murder trial in Perugia Saturday, Carlo Maria Scotto di Rinaldi, the owner of an underwear shop, said the couple came in the day after the murder and she bought a T-shirt and a G-string.
He said:"They were kissing and hugging. They were acting like young lovers. They were speaking in English and I picked up a few words.
"I heard Raffaele say that they would have hot sex, good sex."
CCTV footage shows her holding up the underwear and the owner has said he heard Knox say: "I can put this on and have wild sex with you."
Prosecutors are using character evidence such as this to build up a picture of a "cold and unemotional" Knox which they say points to her being the killer.
Meredith, a Leeds University student from Coulsdon, Surrey, was in Italy as part of a year-long exchange programme with her European Studies degree and had only been in Perugia two months when she was killed in November 2007.
Meredith was sexually assaulted and attacked by more than one person, a forensic scientist told the court.
The jurors were shown graphic photographs and video footage of the post-mortem on Ms Kercher's body.
Police pathologist Dr Luca Lalli said that there were injuries on the 21-year-old's hands, face, neck and legs and that there had also been evidence of sexual activity before she died.
Giuliano Mignini, the chief prosecutor, said the wounds backed up the prosecution case that Ms Kercher was killed after refusing to take part in a drug-fuelled sex game.
Dr Lalli said there was no "biological evidence of a sexual attack," but it was likely that she had been subjected to "non- consensual sex" due to the number of bruises on her body.
Dr Lalli's evidence was held in private without any media or public present after a ruling by the judge following a request from the Kercher family.
Court sources said that American Knox, 21, did not look at the images as they were shown on a video screen and kept her head down while her coa-ccused and former boyfriend Raffaele Sollecito, 25, glanced at them sporadically.
Knox's mother Edda Mellas, who is in Perugia, Italy, to support her daughter said during a break in hearings: "The images upset her too much and she didn't watch them."
Francesco Maresca, the Kercher family lawyer, said that it could not be "ruled out that hasty sexual activity, which would not leave signs of resistance, had taken place after she had been threatened with a knife."
The trial continues.