In the UK, Match was also implicated in the case of serial rapist Jason Lawrence, who in 2016 was convicted of raping or assaulting seven women he met on the site, after contacting thousands.

Not all countries in which sites operate have databases such as Match’s, however, and even those that exist tend to have incomplete data.

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A total of 58 people were victims of online dating-related crimes in those four years, some of them sexual. For context, in 2012 the area had an overall average of 243 sexual assaults and rapes every month.)Many apps offer a page of advice for safe dating.

But Leech wants other protections, like giving users alerts about potential risks before they ever begin chatting with strangers.

Victims, as well as perpetrators, hide crimes: Only an estimated 17% of all rapes, app-linked or not, are reported to police, the NCA said.

Nevertheless, while app-related assaults were still rare, they were rising fast enough for the NCA to flag the emergence of “a new type of sexual offender.” Usually a man, he’s less likely than other sexual offenders to have committed any kind of crime before, but instead exploits the “ease of access and arm-chair approach” to meeting people that dating sites enable.

A local council member in Manchester, in the north of England, Leech this year launched a campaign to make online dating companies commit to keeping their users safer.

Over the past four years, 17 people in the Greater Manchester area have reported being raped after using one of two apps, Grindr and Tinder, according to police statistics obtained by Leech through a freedom of information request.

In 2016, the UK’s National Crime Agency (NCA) released findings on data from police forces around the country. Not all the forces collect data specific to dating apps.

Not all people who report attacks mention whether an app was involved.

Decisions to meet arise from limited information: A convenient location; a sultry glance captured in pixels; a mutual interest in “banter.” In 2014, Tinder users were spending as long as 90 minutes a day on the site.

But fake profiles abound, sexual predators use the sites, and some common online dating behavior—like meeting alone after scant acquaintance, sharing personal information, and using geolocation—puts users at risk.

Most notably, 72% were carried out in the home of either the victim or the perpetrator, and 41% of the dates that led to assaults started at home, rather than moving there after an initial meeting somewhere else.