Sizes 6 and 8 are normal and acceptable if they aren't retarded vanity sizes (for example, an 8 from old navy is more like a 12 from a reality-based brand.) Not skinny, not gross; what a sane person would call "average." Someone could be an 8 and have a flat stomach and no rolls if they are actually curvaceous as opposed to euphemistically, but its definitely pushing up against ham territory. 12 isnt huge, they wouldn't be spilling into the adjacent seat or have a big fupa or anything, but it's definitely too fat to be attractive.  Once upon a time, 12 was the threshold for what was considered plus size. Nowadays, a vanity-sized 12 (closer to a true 16) is called a smallfat and excluded from bopo by redfaced hamplanets. Any size starting with a 2 might as well be a 50-gallon trash bag. Someone that big is too far gone to come back to looking human let alone fuckable.