Tech News World – Trawling porn sites used to be the best way to pick up an electronically transmitted disease on your smartphone. That’s not the case anymore. Every one in five times a mobile user is redirected to a malware site on the Internet, it’s done through a malicious ad, according to a report released last week by Blue Coat. That’s three times what it was two years ago. One reason malicious ads have been able to outperform porn sites is they can garner more traffic than the smut peddlers. “We’re seeing a shift in mobile user behavior,” said…