There is some evidence to suggest that using lubricant during sexual activity can reduce the risk of HIV transmission. Lubricant can help reduce friction during sex, which can decrease the likelihood of condoms breaking or tearing. Additionally, some lubricants contain ingredients that have been shown to have anti-viral properties. However, it is important to note that using lubricant alone is not enough to prevent HIV transmission, and it should be used in conjunction with other prevention methods such as condoms and regular HIV testing.