Ignore it. If they actually had anything they would know they would get better results if they sent a sample picture.
I get these periodically, but I don't watch porn, and my camera is blocked, so I know it's fake. I first got one after Columbia Athletic Club leaked their email list. I know they leaked because I own an internet domain, all email to that domain goes into a single email box, and I gave those ***holes a dedicated email address. **** em, never giving Columbia Athletic Club another penny. They don't use normal reasonable safety measures that a respectable business does. Won't risk giving them any information that might matter.