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1. Kelly is concerned about the risk of contracting sexually transmitted infections (STIs) if they have sex without using protection like a condom. STIs can be transmitted through sexual contact, and using a condom can significantly reduce the chances of getting infected. Kelly wants to prioritize her health and safety by ensuring that they take necessary precautions to prevent the spread of STIs. In this situation, Kelly's main concern is protecting herself and Mark from potential health risks associated with unprotected sexual activity. It's important for both partners to communicate openly and honestly about their concerns and make informed decisions together to stay safe and healthy.