Have you ever been plagued by thoughts of how many other people your partner has slept with? And in turn, how many people those other people have done the business with? Multiply that by the number of partners you've had, and the mind may begin to boggle somewhat.

Well, here's some weird news you probably didn't expect to read - there's now an online calculator that uses scientific data to work out just how many sexual partners you've been indirectly exposed to. Finally, you can put your mind at ease! Or not.