Semen matching the DNA profile of Ireland and Ulster rugby player Stuart Olding was found on clothing and underwear worn by a woman he is alleged to have raped, a court has heard.
Samples taken from the woman's purple thong-style pants, white jeans and black top were examined by a senior forensic officer who was giving evidence to Belfast Crown Court.
Prosecutor Toby Hedworth QC asked: "Were the jeans examined to see if there were traces of semen?"
Confirming they had been tested, the Forensic Service of Northern Ireland officer answered: "The DNA matched that of Stuart Olding."
The jeans were described in notes as "grubby and stained" with blood matching samples from the alleged victim visible on several areas including the thigh, knee and waistband, the forensic officer said.
The woman's blood was also detected on the crotch area of the trousers, the court heard.
Mr Olding and his Ireland and Ulster team-mate Paddy Jackson deny raping the same woman during a house party at Mr Jackson's south Belfast home almost two years ago.
Mr Jackson denies a further charge of sexual assault.
Two other men are also on trial on charges connected to the same alleged incident.
Blane McIlroy, 26, from Royal Lodge Road, Ballydollaghan, Belfast, denies exposure.
Rory Harrison, 25, from Manse Road, Belfast, denies perverting the course of justice and withholding information.
The jury of nine men and three women was shown photographs of the clothing worn by the woman on the night she claims to have been raped, 28 June 2016.
Asked about tests carried out on her underwear, the forensic officer said: "The DNA recovered matched that of Mr Stuart Olding."
Blood from the woman was also visible on sections of the pants, the court heard.
Later, the forensic officer confirmed that Mr Olding's sperm had been detected on the complainant's black sleeveless top.
"DNA from the semen found matched that of Mr Stuart Olding," she added.
The forensic officer also examined internal and external vaginal swabs taken from the complainant 14 hours after the alleged attack, which did not show the presence of semen, the court heard.
However, there was blood matching the alleged victim on the swabs.
A grey and white duvet cover retrieved from Mr Jackson's bedroom, where the rape is alleged to have happened was also sent for examination.
Mr Hedworth asked: "Was blood staining visible?" The forensic officer answered: "It was yes."
"Was that tested and found to match the DNA profile of the complainant?" the lawyer continued. The forensic officer answered: "It was, yes."
Effects of alcohol raised at Belfast rape trial
Earlier, a forensic medical officer gave evidence on her observations of the effects of alcohol on those she sees in the course of her work in sexual assault investigations.
The officer was a witness for the defence.
She was asked by a defence barrister about her observations of the effects of alcohol on those she sees in the course of her work in sexual assault investigations.
She said that it can reduce inhibitions. It makes us behave in a way we would not normally behave, people do things without being fully aware of the consequences, it also affects the memory, she said.
She also said after a person stops drinking, the blood alcohol levels can continue to rise, it can affect balance and mood.
She said that there will come a time when blood alcohol levels cease to rise and a mood change can come.
You can feel depressed, you can feel regret and remorse, she said.
Mr Hedworth also questioned the witness and asked her, in the case of perpetrators, if alcohol increases arousal and reduces inhibitions. The witness said: "It does."
He asked the medical officer, based on her experience and on research, "do most victims of sexual assault resist it or allow it to happen?"
She replied: "I think it is overwhelmingly that it is allowed to happen."
Before discharging the jury for the day, Judge Patricia Smyth reiterated warnings for jurors not to discuss the case with anyone.
The judge said: "It is your view that counts in this case.
"Please do not discuss evidence with anyone. And, as I have said before, be on your guard."
The case has been adjourned until tomorrow. Tomorrow, the 12-member jury will begin hearing details of the taped interviews given by the defendants when in police custody.
