Blame the combination of advantages HTML messages offer spammers over plain-text e-mail and, ironically, technology intended to block unwanted messages. One reason dirty pictures are showing up in your mailbox is because spam-fighting software filters are increasingly used to block dirty words.

Why do I get dirty spam emails?

How you get porn spam. Simply having an email address is enough to start getting spam. Eventually, thats likely to include scams, phishing attempts, ads for body-enhancement drugs, weight loss products, and, yes, porn.