Browsing some of the internet's most popular pornography websites is increasingly putting visitors at risk, research has found.
Advertisements displayed by the sites, which are visited by millions every day, were found to be installing harmful files without users' knowledge.
Researcher Conrad Longmore found that two popular sites - xhamster.com and pornhub.com - posed the greatest risk.
He said it should be easier for users to report malicious advertising.
He said it was primarily Windows users at risk, but that criminals were increasingly turning their attentions to mobile devices.
While none of the porn sites observed hosted any malware themselves, it was the embedded advertisements within their pages that created problems for users.
"We call these malicious advertisements 'malvertising'," explained Mr Longmore.
"The way the ads are bought and sold across all websites is incredibly complex.
"Ads can often be repackaged and resold so that it is hard to tell where they originated from, and the criminals behind them go to great lengths to disguise what they are doing."
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http://www.bbc.co.uk/news/technology-22093141