I'm big, but not just in the overweight sense. I'm ridiculously tall and really very muscular too, which means that I'm a true example of a BBW!
My partner is overweight, but that's not why I'm with him. I am not repelled by either overweight or thin and I've been out with both, but I'm pretty repulsed by a bigot (it's far more to do with the mind for me).
If picking eye candy, I tend to pick very tall, muscular and Scandinavian (think Magnus Samuelsson, the world's strongest man competitor).
Ironically my body image has improved dramatically as I've aged, bearing in mind that as I've aged I've gained weight (from being a model in late teens) and gained significant disabilities too. When I was younger and thinner I was desperately insecure and would never have worn a mini skirt or swimsuit unless it was for a job. These days I wear what I want to and people can either look or not look, as they see fit.
I'm not sure whether my no longer giving a toss about other people's opinions of me is due to aging or a product of having been seriously ill- either way round I'm quite pleased that it's happened because these days I'm free not to fret about whether I'm conforming to any sort of social norm.