I work out a lot, and have nice abs, but wearing a midriff top almost always guarantees my ribs become a target. I have super ticklish ribs, it drives me insane. I love midriff tops though.
Excellent to see a decent amount of appreciation for a certain body part, especially coming from both genders. And especially with nice abs, you're a welcome presence here.
I looked into it, the more common term is "belly button / navel fetish".
I love it when a potential lee walks around showing her stomach, its like an invitation 😉