As a bisexual woman I would say it hugely depends on how the person is able to "carry" the weight. Some can be quite heavy, but since it's rightly placed (and they know how to dress for their bodytype too), they look more attractive than women who are lighter...

to a degree this is a genetic luck thingy.... but self-presentation plays a big role too (honestly, I find it repulsive in men and women when they try to squeeze themselves into clothing too sizes to small.... and doesn't matter the body type. It makes it appear they gained recently and rapidly).