Sometimes heft is brought about in ladies by a high testosterone level (not always, just sometimes). In fact, there should be a separate sex for fat people, both men and women. In those cases these ladies are just like men and we all know how men are.
The ladies that don't have high testosterone levels just don't get looked at or paid attention to because there are very few chubby chasers. Therefore, whenever a hefty girl can get some lovin' she's not likely to say no.
ask your girlfriend and get back to us ....