DM, .
All 4 people use condoms, you have 4R. The risk is 4 x the risk with the condom.
One person doesn't use a condom, the risk becomes 3x the risk with a condom, multiplied by one times the risk of someone having sex without a condom.
All 4 people use condoms, you have 4R. The risk is 4 x the risk with the condom.
One person doesn't use a condom, the risk becomes 3x the risk with a condom, multiplied by one times the risk of someone having sex without a condom.
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