Planning an interactive safer sex calculator

Most people can't accurately gauge probability and risk. And even if they could, they would need the right data to base their evaluation on. Did you know that when trying to avoid HIV, protected sex with a partner of unknown serostatus is 2.4x as dangerous as unprotected sex with a partner who tested negative? I want to put this information and the risk analysis into a calculator, probably in the form of an html+javascript app.

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I'd appreciate feedback on how you might want to see this work differently. What other data should I use in the calculations? How should I present the results? Would you find this useful?