What is an effective preventive measure against sexually transmitted infections (STIs)?

Consistent use of condoms is recognized as one of the most effective preventive measures against sexually transmitted infections (STIs). Condoms act as a physical barrier that can help prevent the exchange of bodily fluids during sexual activity, which is the primary mode of transmission for many STIs, including HIV, gonorrhea, chlamydia, and syphilis. When used correctly and consistently, condoms significantly reduce the risk of both contracting and spreading STIs.

The other options are not as effective when it comes to preventing STIs. While regular vaccinations can protect against certain STIs, like HPV and hepatitis B, they do not cover all STIs, thus condoms provide broader protection. Avoiding intimate relationships altogether would certainly reduce the risk of STIs, but it is not a practical or realistic solution for many people, as it does not promote healthy sexual expression. Taking antibiotics regularly is not a recommended preventive measure; antibiotics are used to treat bacterial infections after they have occurred, not to prevent them from happening in the first place and can contribute to antibiotic resistance if misused.