Anyone who used their personal or work email to sign up to a site like pornhub should expect that email to be made public one day along with any other data they have on the site, including watch history.
In the case of personal emails, that same email can usually be used to look up the victim on social media (Facebook is an example) to reveal their identity, if, like most people, they used the same email on that social media site.
As most on HN will be aware, data breaches like this are extremely common. Its not a matter of if, its a matter of when. NSFW sites in particular are more juicy targets and often have bad security.
Honestly...be responsible for mail for at a large enough enterprise and all I can say is you'd be surprised how many people make work emails their only emails.
In the case of personal emails, that same email can usually be used to look up the victim on social media (Facebook is an example) to reveal their identity, if, like most people, they used the same email on that social media site.
As most on HN will be aware, data breaches like this are extremely common. Its not a matter of if, its a matter of when. NSFW sites in particular are more juicy targets and often have bad security.