Students are being urged not to suffer in silence when targeted by scams on dating apps, as investigators see blackmail cases rise.
Fraud teams at Nationwide, the UKs biggest building society, said trusted friends could help potential victims avoid sending private or intimate images during new online relationships. Anyone who has been scammed should report cases to the authorities, they said.
One student in Cardiff told the BBC how a drink in the pub had alerted them to the risk of a friend being tricked by fraudsters using AI technology.
Last year, the National Crime Agency (NCA) put out its first ever all-school alert, warning teenagers about the dangers of sextortion.
Sextortion is when criminals pose as young people online, trick a victim into sending sexually explicit material, and then blackmail them.
Annya Burksys, head of fraud operations at Nationwide, said that scammers were "efficient and unrelenting". As a result, these kinds of scams were "commonplace" among students.
Data on such crimes is difficult to gather, as they are recorded in different ways or are never reported at all. A survey by Nationwide suggested 28% of students asked had been scammed, and 50% of students worried about becoming a victim.
Last year, BBC News sent a Freedom of Information request to every police force in the UK, asking how many reported blackmail offences featured the word "sextortion" over the last decade.
The 33 forces (out of a total of 45) who responded recorded almost 8,000 blackmail cases logged with a reference to sextortion in 2023.
The same number of forces recorded just 23 in 2014. All the forces to respond were in England and Wales.
On a night out with friends, Emma Evans, a student in Cardiff, was chatting to one of them about his chats on dating apps.
He suggested the group look through some of the conversations, but one "particularly attractive and particularly keen" match raised alarm bells.
"We looked at this chat and the thing that gave it away was that this person was saying the same words over and over again," Emma told BBC Radio 4s You and Yours.
"For example, he kept on saying how he wanted to find someone who is really passionate over and over again, and he wasnt really answering my friends questions."
The group pointed out to their friend that the language seemed to be the speech patterns of an AI chatbot.
Jim Winters, head of economic crime at Nationwide, urged people not to overshare images, particularly with someone they had never met.
"Blackmail is one of the hardest things to face and its happening more often. Its not easy but if something doesnt feel right, speak up," he said.
"It might be tempting in the moment to share information or photos but once shared, you will never have control over it again."
He has the following tips:
"Talk to someone you trust, maybe a friend or family member. Dont suffer in silence," he said.
As well as targeting young people near the start of their lives, fraudsters have been stepping up their attempts to trick the friends and family of people who have died.
Criminals exploit the grief of bereaved families by impersonating them online and charging mourners to see funeral livestreams that should be free, according to the Chartered Trading Standards Institute (CTSI) which supports businesses and local authorities trading standards officers.
These livestreams became more popular during lockdown, and have continued since for those who struggle to attend a funeral in person.
Fraudsters contact mourners with bogus links to watch a funeral and demand payment, or set up fake donation pages on legitimate websites.
Katherine Hart, CTSI lead officer for doorstep crime, said: "This is a truly despicable scam – targeting people during one of the most emotionally difficult moments of their lives.
"Its hard to imagine a more callous form of fraud. Whats particularly upsetting is that victims often feel they cant report whats happened for fear of adding further stress to grieving families.
"That silence is exactly what these criminals are counting on. We need people to stay vigilant, share warnings and report anything suspicious."