Sexually explicit images and footage of women are being shared by men on the social media platform Reddit without their consent.
Panorama: Inside the Secret World of Trading Nudes, which screened on the BBC, uncovered online groups known as subreddits where thousands of men share, trade and sell intimate photos of women.
These groups were found to still be operating despite the site stating it has banned users from posting or threatening to post intimate or sexually explicit of people without their permission.
Financial consultant turned social media influencer Tanvi Shah was shocked to discover a photo of herself on the site.
"I assumed Reddit is a positive forum where people share reviews and talk about people in a positive way," she told Panorama.
"What made me feel worse is when I looked at the picture, and then I clicked on the comments below," she said.
"I saw so many men commenting about trying to find out information about me, my name, where I live, the things they would do to me which we're both degrading and sexual.
"They were calling me names and that is what really got to me because I felt so objectified and I felt as though I was their property where they were allowed to say and do whatever they wanted to me."
Other women told the BBC they were distressed after discovering images and footage of themselves in these online groups.
Georgie was contacted by a stranger on social media and told explicit images of her were being shared on the internet.
She knew she only shared these photos with one person, her ex-partner.
"I can't even compute how many people might have already seen them?," she said.
"And there is no way of stopping more people seeing them.
"In this moment, right now, people might be looking at them, people might be copying them, downloading them and sharing them.
"They can even print them out and put them on the wall if they want to. Once something's on the internet, it's on the internet."
Georgie went to the police. Despite having a written admission of guilt from her ex-partner admitting that he was responsible, he stated "he didn't mean to hurt or embarrass", she was told by the police that there was nothing they could do.
"At the moment it's only a criminal offence to trade an image on one of these websites if you're doing it directly to cause distress to a victim," Clare McGlynn, a law professor at the University of Durham, told the program about UK law.
"We know that many men trading these images do not want the victims to even know so there's a huge gap in the law.
"The problem is the law only focuses on the kind of malicious ex-partner sharing an image, the kind of revenge porn and this only covers a small number of cases of intimate image abuse."
In New Zealand, sharing nudes without consent could be an offence under the Harmful Digital Communications Act.
The Act's 10 principles include that a digital communication should not: Be grossly offensive, indecent or obscene, or contain a matter that is published in breach of confidence, among other clauses that may apply to sharing nudes without consent.
Those found guilty under the Act can face a fine of up to $50,000 or up to two years in jail.
Netsafe advises that anyone concerned their images have been shared should contact the platform they appeared on and contact Netsafe for further advice.
Panorama: Inside the Secret World of Trading Nudes investigates the disturbing online trade in sexually explicit images and videos of women, often taken and posted online without their consent.
According to the documentary, seven women tried to get their private images removed from Reddit.
Four of them said the material was never taken down and some had to wait eight months before the content was deleted.
Reddit has told the program it removed over 88,000 non-consensual sexual images last year and said it takes the issue "extremely seriously".
"We know we have more work to do to prevent, detect, and action this content even more quickly and accurately, and we are investing now in our teams, tools, and processes to achieve this goal," a company spokesperson said.
SEXUAL HARM - DO YOU NEED HELP?
If it's an emergency and you feel that you or someone else is at risk, call 111. If you've ever experienced sexual assault or abuse and need to talk to someone contact the Safe to Talk confidential crisis helpline on: • Text 4334 and they will respond • Email support@safetotalk.nz • Visit https://safetotalk.nz/contact-us/ for an online chat Alternatively contact your local police station - click here for a list. If you have been abused, remember it's not your fault.