Among sexually active individuals, which is a significant risk factor for contracting HIV?

The significant risk factor for contracting HIV among sexually active individuals is being sexually involved with an individual who has had multiple partners. This is because individuals who have multiple sexual partners are at a higher likelihood of being exposed to sexually transmitted infections (STIs), including HIV. This increased exposure occurs due to the potential for those multiple partners to also have had contact with other individuals who may carry the virus. The risk amplifies particularly if protective measures, such as the use of condoms or regular STI testing, are not practiced.

Limited sexual education can contribute to riskier behaviors, but it does not directly correlate to a heightened risk like having a partner with multiple sexual partners. While having sexual relations occasionally may reduce exposure in theory, it does not negate the risk if those encounters are with high-risk individuals. Engaging in consensual monogamous relationships generally lowers the risk of HIV transmission because the exposure is limited to one partner, reducing the chance of encountering the virus. Therefore, being involved with someone who has a higher number of sexual partners significantly increases the risk of contracting HIV.