The website which competes with OKCupid and Tinder and is straightforward in hookup policies and asks its subscribers to submit their private sexual information, including preferences, fetishes, and more. That is what the hack on AdultFriendFinder makes a serious issue because in addition to their marital statuses, dates of birth, locations, and email addresses, the hackers may have excess to very private and confidential information about their fetish and sexual orientation which can be used for blackmailing of the users. The breach was first reported by U.K. news outlet Channel 4, which said information from nearly 4 million AdultFriendFinder users was lost in the incident. AdultFriendFinder has confirmed it’s working with law enforcement and data security experts following a data breach, USA Today reports. AdultFriendFinder told USA Today that it has “begun working closely with law enforcement and launched a comprehensive investigation with the help of leading third-party forensics expert, Mandiant.” Channel 4 reports that some of the data was linked to users who had attempted to delete their profiles on the site.