I'm my dog's sexual partner, I'm his bitch. I don't think of it as a negative term at all, and you know when people are using it negatively. I have had plenty of other women on here refer to themselves as bitches, and are proud of it.
All in all it's probably up to the individual person and the context that it's being used.
All in all it's probably up to the individual person and the context that it's being used.