Anal masturbation is an erotic stimulation focusing on the anus and rectum. Large anal glands above the anus open into this pouch. Large anal glands open into it from above the anus. This frequently refers to MSMs who are penetrated via the anus during anal sex. Anal bleaching is the process of lightening the color of the skin around the anus. True anal piercing is rare because it may interfere with the function of the anus. Hair around the anus area and labia may be removed. The main symptoms are itching in and around the anus and perineum. Human papillomaviruses are an established cause of cancers of cervix, skin, anus, and penis. Social meetings involve mutual sniffing of the oral area, anus and genitals. Males have two slits, one concealing the penis and one further behind for the anus. The skin around the mouth, anus, and inside of the ear is considerably thinner. A visual examination of the anus and surrounding area may diagnose external or prolapsed hemorrhoids. Skin mottling is usually seen around the muzzle, eyes, anus, and genitalia. In these cases, their use is restricted to cleaning the anus and genitals.