"These emails are masquerading as pornographic content, tempting the unwary into opening a file on their Windows computer which will install a rootkit and download further malicious code from the internet," said Graham Cluley, senior technology consultant for Sophos.

You don’t say!

Here’s a rule of thumb for anyone wishing to view nudity: Go to the internet instead.  Unless it’s from a friend or trusted source, leave it alone.  It might take a few extra clicks – a huge exertion, I know – but you’ll find that nude photo sure enough with just a little old fashioned determination and perseverance.