A London-based student allegedly committed rape after arranging on social media to meet three young women in Northern Ireland, a court heard Tuesday.
Police also suspect Daryl Concepcion secretly filmed a sexual encounter with one of them, aged 17, and shared footage online, the judge was told.
The 18-year-old defendant appeared before Belfast Magistrates' Court accused of committing offences during a three-day trip last week.
Concepcion, a Filipino national of Lovell Place in London, currently only faces charges of raping and sexually assaulting one of the females between August 4-5.
He was granted bail but banned from contacting any of the women or having any recording devices.
A detective constable told the court he is under investigation for alleged sexual contact with all three females.
Meetings with the trio - one from Co Antrim and two from Birmingham - were said to have taken place at locations in Belfast and on the north coast.
Images and videos recovered from Concepcion's mobile phone are being examined, the court heard.
Defence solicitor Eoghan McKenna stressed that only two of the women have made statements to police.
He said the third female has described any sex with Concepcion as consensual, adding that his client was invited by them to Northern Ireland.
But the detective replied: "It's believed there was a video taken of this sexual interaction, the lady in question was 17 and she had no knowledge of it being taken.
"Police believe these videos were then shared on a group chat via Facebook."
She confirmed the accused hadn't physically known any of the females before travelling from London, but had been in social media contact with one of them for a year.
Concepcion, who is due to start a tourism course after completing his A Levels, was granted bail on condition that he puts up a £5,000 cash surety.
Deputy District Judge Laura Ievers also prohibited him from any internet access.
He is due back in court next month.