British backpacker Grace Millane discussed sexual fetishes including bondage and 'breath play' with a man she met on a kinky dating site, her murder trial heard today.

The man, who was not identified, described 22-year-old Miss Millane as 'naive and trusting' and said she was interested in exploring BDSM sex, but lacked experience.

The jury was told of Grace's interest in BDSM as it was revealed that she met and had sex with another man on the night before she died in December 2018.

That man told Auckland High Court that he 'potentially' held his hand around Grace's neck during sex, but that he had not discussed it with her beforehand.

A third man, 27, whose identity cannot be revealed for legal reasons, is on trial accused of murdering Grace during a Tinder date, photographing her corpse, then stuffing her remains into a suitcase and burying her in the woods.

He admits moving her body but denies murder, saying she died accidentally during rough sex and he didn't realise until the following morning.

Grace Millane (pictured) discussed BDSM sex with a man she met on a kinky dating app, including her interest in electrical nerve stimulation and 'breathplay' using a gas mask

The evidence was revealed as the defence team closed its case. Both teams are due to present closing arguments Thursday, before the jury is sent to consider its verdict.

The day opened with a statement given by a man that Grace met on kinky dating site Whiplr in the summer of 2018, before she left on her round-the-world travels.

Grace's parents David and Gill listened to the statement from the public gallery.

The man said that Grace revealed she had begun her interest in BDSM through a past boyfriend but he said she was still quite naive and, unusually, used her full name on another messaging app they had used.

'Grace and I discussed our BDSM interests,' the man, whose identity is protected, had told police.

'Grace told me she was interested in everything to do with BDSM and her main area of interest was restraint.'

Ms Millane contacted the unidentified man via the Whiplr website (pictured) for BDSM enthusiasts in summer of 2018, just before she left Britain on a worldwide adventure, he said

She told him she had begun her interest in BDSM through a past boyfriend but he told the court she was still quite naive

'In Grace's Whiplr profile she outlined her sub kink interests as: giving full control, sounds, accessories, restraints, control and massages.

'I think Grace was at an explorative stage and quite open to suggestions. Grace seemed quite keen to know what things were and what sort of things I owned pertaining to BDSM.

'I told Grace about my interest in breath-play, electro and water bondage which I had to explain to Grace because she didn't know about it.

'I explained my interests with explicit examples of what I have done with partners previously. Grace told me she was quite open to it and said she wanted to try.'

Jurors were told the man had given the statement to police, before refusing to cooperate with defence lawyers.

A 27-year-old man, whose identity is also protected, has denied murdering Ms Millane (left and right) on December 1 last year, the night before her 22nd birthday

Another witness then told the trial he and Grace had slept together the night before she died after meeting at the backpackers' hostel where she was staying.

The man, who name is suppressed, said they went to McDonalds before going to his house to watch a movie, then had sex.

He said he may have held her around the neck during sex but not at her request.

It was something he had 'potentially' done because it was a habit of his 'because girls usually enjoy it', he said.

There was no discussion about it with Ms Millane, who had stayed the night with him.

The court had previously heard a statement from a former partner of Ms Millane's, who said they had an established practice of choking using safe words and 'tapping out' which meant it had never put her in danger.

A 27-year-old man, whose identity is also protected, has denied murdering Ms Millane on December 1 last year, the night before her 22nd birthday.

He claims she died accidentally after asking him to apply pressure to her neck, but in a police interview said he was unaware she had died until he found her on the floor the next morning.

CCTV shows the defendant inside CityLife hotel in New Zealand with the suitcase loaded onto a luggage trolley - with Grace's body stuffed inside

The defendant is pictured returning to the hotel with the suitcase he bought after Grace died

The defendant's identity has been suppressed by the court in Auckland

He admits disposing of her body in a suitcase he buried in the woods.

In the statement read today, her Whiplr contact said he and Ms Millane had agreed to meet in person for a drink but she then changed plans.

'BDSM probably became more popular after 50 Shades of Grey but that is more the soft end of BDSM,' he said.

'I don't recall if Grace ever mentioned 50 Shades of Grey. I felt like Grace was more naive and trusting in the BDSM area. When you're using these apps, the users do not have to provide any details at all so you have to be aware.

'The users could be any undesirable person online and Grace seemed to have a naivety.'

The jury were also told about messages Ms Millane exchanged with two unknown men on Whiplr in 2017, in some of which she took the role of a 'submissive slave' being given tasks by a dominant 'master'.

She had said she wished to be 'fully restrained during sexual activity', said defence barrister Claire Farquhar.

The court also heard from a leading expert in sexual culture and pornography, Professor Clarissa Smith, from the University of Sunderland.

Shocking pictures shown to the jury revealed the moment police discovered the body of murdered British backpacker Grace Millane dumped in this muddy hole in the ground

Speaking via a video link she said erotic asphyxiation, like other forms of BDSM, was becoming a more mainstream interest for young women and men in the wake of the 50 Shades of Grey book, which has sold 125 million copies.

She described it as 'a form of play that practitioners call edge play. It makes the heart race, makes the skin tingle, had very significant elements of feeling powerless and offers lightheadedness and exhilaration.'

But Professor Smith said: 'It's very important that consent is given.'

She told the court how younger women were increasingly open about sexuality and saying what they wanted and that 'hook up' apps were part of 'a gamification of dating and sexuality.'

'We are no longer living in the era of lay back and think of England,' she said.

The defence have closed their case, with the defendant choosing not to give evidence. Prosecution and defence will give closing speeches on Thursday before the judge sums up on Friday.

The trial continues.