Ashley Madison say their members come from all walks of life and include singles, those attached and seeking an affair, or attached in an open relationship.

In 2015, Ashley Madison was rocked with the scandal of their database being hacked and personal details of their members being released to the public.

There is also the issue of the seven million user accounts, which should have been wiped from Friend Finder’s books given they sold the site to Penthouse Global Media earlier this year.

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Started in 2005, Brazil Cupid is part of the well-established Cupid Media network that operates over 30 reputable niche dating sites.

Adult Friend Finder touts itself as “the world’s largest sex and swinger community”, helping users “hook up, find sex or meet someone hot”.

the company had been made aware of “vulnerabilities” in the system.“Immediately upon learning this information, we took several steps to review the situation and bring in the right external partners to support our investigation,” she said, not confirming whether there had actually been a mass leak.

The Adult Friend Finder hack resembles the leaking of 33 million Ashley Madison accounts in 2015 not only for revealing intimate sexual information presumably wanted kept private by users, but also in revealing that dating sites often fail to purge deleted accounts.

An anonymous reader notes this report from Channel 4 News that Adult Friend Finder, one of the largest dating sites in the world, has suffered a database breach that revealed personal information for 3.9 million of its users.

Channel 4 saw evidence that there were plans for a spam campaign against these users, and others are worried that a blackmail campaign will follow.

"Where you've got names, dates of birth, ZIP codes, then that provides an opportunity to actually target specific individuals whether they be in government or healthcare for example, so you can profile that person and send more targeted blackmail-type emails," said cybercrime specialist Charlie Mc Murdy.

Ashley Madison is a dating site that was originally formed back in 2001 for people who were married or attached in relationships and were seeking a partner to have a discreet extramarital affair with.