A dental dam is a thin, flexible sheet made of latex or polyurethane used during oral sex to reduce the risk of sexually transmitted infections (STIs). It acts as a barrier between the mouth and the genital area, providing protection while allowing for safe oral stimulation. Dental dams come in various sizes and flavors, making them more appealing for use. They are typically used by placing the dam over the vulva or anus, ensuring that there is no direct contact. Proper use and disposal are important for maintaining hygiene and effectiveness in preventing STIs.