Embarassed for others....

never lend your GF a computer that has had many more users than yourself for prolonged periods of time without wiping it first. It cuts down on the awkward emails that come in when she is sick and using it out of boredom.. Particularly when she thinks that you have been the sole user of said machine...

And then emailing back and desperately asking not to be told the specifics because then you will be pondering which of the potential users did access those sites…