Almost half of you will know this already: 40% of home internet users look at porn sites, a web-monitoring company said today.

Many surfers spend more than 45 minutes logged on to X-rated material each month, according to Netvalue.

It said that 3.8m home users in Britain - more than a quarter of the entire home internet population - logged on to adult sites in June.

Of the 9,411 websites that the company's survey sample of 5,000 people visited in June, 3,879, or 41.2 percent, were pornographic.

British surfers may be getting hot under the collar, but Germans are credited with the most insatiable appetite for internet pornography in Europe.

Netvalue said that more than 5.3m Germans visited porn sites in June.

"Pornography has become a lucrative online business, with many companies now recognising it as a valuable additional revenue stream," said Alki Manias of Netvalue.

"This would seem to be a stable business area - the popularity of online pornography continues unchecked."

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Netvalue