Is biuality and personality disorders somehow related?

Is ity and personality disorders somehow related? The reason why I ask is because I've dated a few girls who had borderline personality disorder and bipolar disorder. They were both extremely promiscuous, which is why i'm not with them anymore, and were very much into girls. They were all biual, but it seemed to me that a lot of them were more into girls than guys. They were all messed up in the head with their disorders and were always promiscuous and wanting to make out with girls all the time. Is there some relationship between personality disorders and ity?