A form of partialism fixated on, and involving stimulation of, a character's navel. Can be done as foreplay, or as a standalone act.
This can explicitly be linked to the erogenicity or sensitivity of the navel and surrounding areas.

Such stimulation can include;

• tickling,
• licking,
• fingering,
• pulling,
• and poking, among other things.

Usually implies:

• navel_fetish

Does not include, but may precede:

• navel_penetration,
• navel_sex,
• navel_vore,
• and/or navel_torture.