Cosmetics
Shaving, trimming, depilatory (hair removal), or Brazilian waxing can clear the perineum of hair.
Anal bleaching is a process in which the anus and perineum, which may darken after puberty depending on individual genetics, is lightened for a more youthful appearance.
True anal piercing is rare because it may interfere with the function of the anus. However, surface piercings of the perineum are easier to care for and much more common.
Read more about this topic: Human Anus