As friends, yes they do seek each other out and they can form very good friendships.

As lovers, I wouldn't count on it. I mean, I really wouldn't try that. I have BPD, I'm in group therapy for BPDs only and that just honestly seems like a very, very bad idea to me (and, I'm sure, the other people in my group would agree). I feel like I need to emphasize these words even more, but I think I made my point now. Theoretically I guess it could work, but you can bet all your money that it just won't. With any other PD I think it could work.