A BEST man allegedly raped with a sex toy by a stripper had stepped in for the groom who "wasn't interested" in his buck's party's strip show, a court has heard.

A witness told the Melbourne Magistrates Court yesterday the alleged victim had been egged on by a cheering crowd of up to 30 men to perform with the hired stripper after the groom sat down after spending less than a minute with Linda Maree Naggs.

"All the boys were there wanting a show," he said.

Naggs, 39, has been charged with raping the best man, who told police he was sexually penetrated with a vibrator during the party on the Mornington Peninsula last September.

One witness said the best man had looked uncomfortable throughout the performance and was forced onto all fours by Naggs, who was naked and wearing a strap-on sex toy.

The witness said he heard the man scream and get to his feet.

"'Why did you do that for? … you didn't have to do that'," he said the man yelled.

The court heard the man then pushed Naggs in the chest. She retaliated with a right hook but missed, and threatened to "come back with my bikie mates".

"She was a little bit hysterical … she thought she was a boxer," the best man's brother told the court.

He said Naggs had been riding his "very conservative" brother like a dog or a horse before the alleged rape.

The brother denied he had seen any drugs at the party where two strippers performed and topless waitresses served drinks. He said the men had been loudly cheering in a "mature way" during Naggs' act that began with her whipping the man next to him in the groin.

The witness said he could not remember Naggs saying she would call the police or being struck on the head in an upstairs bedroom.

The court was closed to the media and public while the alleged victim gave evidence for just under two hours.

Dr Biswaden Mitra, of the Victorian Institute of Forensic Medicine, said the alleged victim had an abrasion the day after the buck's party. But shown photographs of the sex toy, Dr Mitra said he could not say if it had caused the minor injury.
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