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How are sexually transmitted infections primarily passed?

  1. Through sharing food

  2. Sexual contact

  3. Airborne transmission

  4. Touching contaminated surfaces

The correct answer is: Sexual contact

Sexually transmitted infections (STIs) are primarily passed through sexual contact, which includes vaginal, anal, and oral sex. During these activities, the exchange of bodily fluids such as semen, vaginal secretions, and sometimes blood occurs, creating an opportunity for pathogens to enter the body of a partner. The nature of the infections, which are typically caused by bacteria, viruses, or parasites, necessitates direct contact with infected bodily fluids or sores. The other options do not accurately describe how STIs are transmitted. Sharing food, for example, does not involve the exchange of bodily fluids that would lead to the transmission of infections specifically categorized as sexually transmitted. Similarly, airborne transmission pertains to diseases that spread through respiratory droplets or aerosols, which is not applicable to STIs. Lastly, while touching contaminated surfaces can lead to infections like the common cold or flu, it is not the primary mode of transmission for STIs, as they are not spread through indirect contact in this manner. Overall, sexual contact is the definitive route for the transmission of sexually transmitted infections.