Perineum sunning or butthole sunning is a wellness practice that involves exposing the perineum (area between the genitals and anus) to sunlight. Adherents claim various unproven health benefits such as improved libido, circulation, sleep, and longevity. [1] There is no scientific evidence that this behavior promotes any of the alleged benefits. [1] The practice of exposing a sensitive area of skin to sunlight also increases the risk of skin cancers [2] such as melanoma, squamous cell carcinoma, and basal-cell carcinoma. [3] Doctors recommend safer alternative options such as relaxation, meditation, and mindfulness, which can also achieve the same desired benefits. [4]