At this time, Motherboard doesn’t know exactly how these websites work, beyond their claims to be using “facial recognition” technology. We contacted the creators of Porn World Doppelganger and Porn Star By Face, and will update when we hear back. Porn Star By Face says it has 2,347 performers in its database, pulled from the top videos on Pornhub and YouPorn. We don’t know whether the website sought these performers’ permission before adding them to this database.

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