i receive email using my email account for drugs, and porno why?

[Mikeâ€]

There are programs that are used to "scrape" emails from various websites, like Facebook, Twitter, Youtube, or pretty much any place.
Yours probably got scraped from somewhere.
Then, there are email senders programs that allow you to set a custom sender name. They're often used in advertising websites by affiliates who promote various offers.
You can filter these kinds of messages if you're using Gmail, or you can simply block messages from a certain email address if you're using Hotmail. I'm not too sure about Yahoo mail, though.