Everyone is their correct weight for where they are. If they are obese then there is some kind of benifit or pay off from it. Whether it be the satifaction of food that out weighs the body size, or emotional factors or even an excuse for why someone might not like them. Many times I have encountered "You just don't like me because I'm fat" when in reality I didn't like them because they were rude and obnoxious, or stuck up.
I happen to be one of those lucky geneticaly thin types and haven't gained or lost a pound in almost 25 years. I could't gain weight if I tried and I have. However I have always kept in line with my metabolism and listened to what my body needs, I know when it needs meat protien, when it needs fruit sugars,citric acid or veggie vitimins, straight carbohydrates, or chocolate (yeah gotta have my chocolate). I can be ravenous and eat a 3000 calorie meal and then forget to eat for a day and a half. Your body will tell you if you listen.
I'm also very open minded when it comes to sex, dating and relationships. Yes, I have had sex with all sizes and shapes and if you take personalities out of the picture and put it on the purely physical side. I'd have to say I'm not turned on buy fat women. but it's not so much do to the size as it is two other factors. Breathing and hygine. Let me explain. I love eating pussy! There little better in life than a woman cumming on my face, fingers, and tongue. In order for me to stay ther to complete my activities I need air. And lots of extra flesh in that area can be suffocating, litteraly! so if I have to move the equivalent of a 20 lb. honeybaked out of the way to get to what I want to eat it's not going to work. The second issue is when there is that much extra flesh it crates an anerobic environment where bacteria can thrive. The majority of obese women I have experienced were not very fresh down there and several I couldn't even get close to. You want to talk about turn off? So if your a heavy woman, take extra care and keep it clean and don't be afraid to take your panties off, spread your legs wide and let it air out. You'll be more the fresher for it.
I'm also a big hugger and don't like hugging an anorexic turkey carcass of a chest either, but would like to at leats touch finger tip to elbow when giving a hug to a woman. If I can't touch finger tip to finger tip then there is more than I want to delve into.
So man who has been there, done that, I'd have to say No, No, and no.
And as a footnote, Change the mind and though process and the body will follow.