Thongs can be a popular choice for those looking to avoid visible panty lines, but they come with their own set of risks. The design of thongs can cause them to move back and forth, potentially transferring bacteria from the anal area to the vaginal area. This can increase the risk of infections such as urinary tract infections (UTIs) and bacterial vaginosis. If you do choose to wear thongs, consider limiting their use and opting for breathable materials.