Here's how it ranks with me:
TOO Skinny, Disgusting actually:
A little skinny, but attractive:
Pretty much "perfect" ranging from on the skinny side to on the chubby side:
A little chubby, but potentially attractive:
Too Chubby, unattractive:
I think my ideal is somewhere between Jennifer Beals and Sara Ramirez. But I definitely agree it's not all about looks. Attraction is definitely a vital point, but it's only one point of many. There are many factors I would take and overlook weight, to an extent. There are also things I can't overlook. If I can see your ribs while you're NOT sucking in, that's horridly skinny and I can't deal. If your back has as many rolls as your front, I have an issue. If you look like this:
I also have an issue. That about sums my views up.