If you are on the internet, your activity is tracked.
Porn sites are no exception. You don’t even have to be logged into an account, and your selections, pauses, fast forwards, and screenshots are saved and put into a data mining engine.
If you do have an account, they use this data to give you better options that suit your tastes.
Fortunately for the privacy of its clients, the data collected is not sold to third parties, at least not from MindGeek, the primary company that owns most of the porn (and other sites) on the internet.
You can read more about how the data is collected and what they do with it here.
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