I'm a computer engineer by trade, so I'll give my perspective on this topic:
Most illegal content sites are monitored by the department of internal affairs or FBI or whoever. So they know who's using them without even having to check computers for files. And if files are deleted, they're rarely ever truly deleted. Forensic experts can even get files back off a hard disk that's been smashed.
To make the story about the cat even remotely plausible, the man (who was probably illegally downloading music anyway) must have been on a site which was closely related to an illegal porn site - ie, with direct links on the web page to the porn content.
So, in other words, he did it.
A word of warning to anyone wanting to illegally download movies or music or whatever: where there is illegal content, you will be presented with more illegal content, like it or not, via pop ups or links or what-have-you. And everything you do on the Internet can be traced back to your house. It's like '1984'. But this is necessary to protect our kids and society as a whole.
Now that was awfully serious, wasn't it? But important that everyone should know and understand how things work.
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