I'm 32 and didn't get diagnosed until less than a year ago. It was bleeding obvious I had BPD--but what you say is true, doctors see men and they'd don't even think to look for BPD. It's sexist and it pisses me off. We aren't all that rare, actually. It's a ratio of 75% women and 25% men. Sure, that makes us a minority. But I'd say one quarter is a fairly sizable minority, wouldn't you? I got diagnosed with major depression and anxiety disorders at 20, and then misdiagnosed as BP II around 25. They thought they'd found the missing link, as did I, until I came to realize I was nothing like a Bipolar individual. Those with purely depression or bipolar didn't act like me--not out in the real world or on forums. I basically got shunned. Here though, surprise surprise, I can recognize something of myself in even single person here. It's rare I that I see someone that I don't relate to and I'm not shunned as most are likely seeing something of themselves in my behavior.
And yes, male borderlines getting diagnosed as antisocial is incredibly common. It's as common as both males
and females getting misdiagnosed as BP II. It is a common enough occurrence though for people to have both BP II and BPD though. BPD is believed these days to be related to BP type II and epilepsy. Just, the way the system runs doctors prefer to trash one DX and favor another which is idiotic and in neither their favor or the patients. I think they're lazy or un-knowledgeable.
I was given meds for Bipolar type II but unlike you, coincidentally I stumbled across one that did work--that is, Lamictal. I came across it as I tried and fought the hell for years, both to find a med that works, and to survive. I tried it all. I came to find out later that Lamictal is among the front line treatments for BPD if not the front line treatment. Funny how things work sometimes, eh? It didn't help though as if I'd been diagnosed correctly and gotten Lamictal, I could have began figuring myself out 7 years ago, or 16 years ago for that matter. I perhaps could have been seeing a psychologist, and could have been getting CBT. But merely know about it would have helped me a great deal by now, as having only been diagnosed a year ago I have begun to make rapid improvements. Largely from my own study and understanding of myself --why I do the things I do, why I feel the way I do-- as well as from this forum. I could have sought out others like myself a long time ago.
I don't think about it much though--as since I was in the US at the time there was a snowballs chance in hell of me being diagnosed properly, and even if I had been I know I wouldn't have got any therapy of any sort for it. See, it went from disabling me mentally, to crippling and all but destroying me mentally. So, with a long of effort and way too much time I ended up on disability and got very crappy state-run heath care. The state wouldn't have paid for it, and my family wouldn't have...
So while I don't think 'what if', I am instead pissed the ###$ off about it. Surely the worlds super power wouldn't be in the dark ages in regards to both mental illness and health care! No, surely not...
As far as me being drawn to BPD women, yes. It doesn't
have to be romantically but it has often been the case. I've been simply good friends with some--and no, not as something was stopping me from making it something more. It was just better left that way.
Anyway,
I think the simple question for us both as to why--is that we understand them; and we know they immediately understand us. Yeah, the relationships more often than not end up as a train wreck but the ride is awesome (dare I say ecstasy) while it lasts--at least in the earlier stages. Some people will tell you it can never work between two borderlines but I'm not convinced. I think two borderlines who are aware of it and work hard together in the relationship it can work.
What better partner than one who understands our behavior completely and doesn't bat an eyelid at it? I don't mean working together on each others BPD --not on does the create co-dependency but both will end up making each other worse-- but rather avoiding and work past, around and through its inevitable interference and clashing in said relationship. Also, both he and she at least he or she talking to a psychologist on a regular basis--I don't like the impression I get of DBT, and I'm not totally convinced on CBT either. Basically, I don't think there's a cure and searching for one will just make us tools. CBT takes a more logical approach and seems to focus more on mechanics. I want my emotions left alone for me to sort out, using mechanics to aid in that. We're all different though so w/e.
But yes,
The relationship will be a bit chaotic--but hey, aren't we, our emotions and our lives already chaotic? I also feel if I could find a girl with BPD who is serious about a committed relationship, she'd be less likely to leave--I believe. Also, there's no way in ###$ I'm going to have some girl think of herself as the 'healthy' one (like some martyr) with the mentally ill partner (nor will I have her friends and family thinking of the relationship in the regard), never mind the idea of them being the 'stronger' one.
Pfft, stronger one...
HA!
Edit: Oh, let me grab you some links. I don't mind as we BPD 'minorities' have to look out for each other, yeah?

lol
Peace
"I assess the power of a will by how much resistance, pain, torture it endures and knows how to turn it to its advantage." -- Friedrich Nietzsche