Most women look at personality? Please tell me you don't really believe that do you? Maybe in other women but I have not yet met a single human being (male or female) who doesn't look at how a person looks first and foremost. Now everyone is different, some like big, some like small some like big boobs some little boobs.
Now to define what is "fat".....fat is any amount of excess weight a person carries. I think the meyers (is that the name?) BMI index states that anything over 5% for men and 10% on women is "fat".
As the saying once said "if you can pinch more than an inch" that's fat.
Now whether or not that is attractive to someone, that is 100% subjective. I for one prefer thinner women because, it is much easier to get a woman to GAIN weight than it is to get her to lose it......
(btw, before anyone starts things like: you aint' no gq yourself, I will say this: when I was 21, I had a 30" waist, 30 yrs later I've got a 32")