So many people asked me this before: "What is a crotch belly?" "How does it work?"
I'll simply tell you with 3 "boxes!"

Chest Belly:

It's weird I put this first, true, but this applies with my lover boy, Rogus247. Chest bellies are an "opposite" to crotch bellies in both position and factor of pleasure. Chest bellies are tight, and make a thumping noise if wiggled hard enough. They also allow the sound of a close heartbeat.
(More?)

Belly:

Commonly used in Vore, It gives both Satisfaction and a sense of humor or power over another. Located on the middle/lower body. It is the most common to see these on Anthros and Ferals. Unlike what me and Dominick do, they are naturally digestive for some, for us it is just like a fleshy safe prison. Everything has a gut, no exceptions.

Crotch Belly:

The final of the 3 ones, Excluding tail. This one is located directly over the groins and/or between the hind legs/haunches. This belly is used to pleasure the predator, establish dominance, and/or pleasure the prey. The word Pleasure here does not refer all the time as a Sexual tag. It is a feeling of pleasure not my cock is rock hard from this pleasure juice. Crotch bellies are usually soft on stretchy characters, Squishy dragons and Bats have the 2nd best tied. #1 are Samurotts (SAMU). This stomach is separate from the natural system meaning it is not digestive ever. It also has 2 exits, the entrance, and rarely the bum tube. I commonly use such a belly in my art~
(Could use more?).