Why would someone want to tough a belly button?

The navel region is an erogenous zone with heightened sensitivity that when touched by the finger or the tip of the tongue can produce erotic sensations. Individuals who are ticklish in that area can be aroused by tickling, blowing raspberries, or being teased with a feather, flower, or blade of grass. The noun omphaloskepsis means "the contemplation of one's navel," and you could use you see a little kid who is obsessed with his belly button. More often, it describes being so wrapped up in yourself that you lose track of the world around you — a metaphorical navel-gazing. Massaging the navel helps to regulate agni (digestive fire) for enhancing digestive abilities, regular elimination of waste from the bowel, and digestive troubles associated with gas and bloating.