I can imagine it getting pretty intense if you both have DID, but it's good to hear that you can sense when you both need to ground yourselves; that's always a good thing to notice.
It is quite intense, but that's also because we both have BPD, depression, PTSD and are both recovered from eating disorders. We're both praying and hoping that we can bring our child up in a way that minimises her chances of getting anything from us, or having anything made worse by us.
As for someone who doesn't have DID, how do you deal with being romantically and physically involved with the "host" ((haha minerva doesn't like that word...)) but anyways would i treat his/her alters like sister and brother-in-laws? What would happen if another alter surfaces and wants to be physical with me. If you don't realize it would that cause issues?
This is another part of how mine and my hubby's story is a bit unique (from what I've heard of others with DID). Obviously I'm romantically and physically involved with him, but then two of my female alters and two of his male alters are also couples.
As for the rest of those in the system, we've all formed different relationships. His only little calls one of my alters mum, and the rest of us are more like close friends or aunties and uncles to her. One of my littles calls my husband dad, another calls him brother.
When it comes to a physical relationship with alters other then the one you are dating, that's something that needs to be talked over between you and your partner. I know a lot of hosts don't like the idea, and like it even less in practice, but over time it's something that everyone can get used to. For my system, provided other alters don't get all the physical time, I don't mind them and my husband doing anything together. I'd rather they take care of those desires at home, with my husband, then going out and finding someone else who will do it with them instead.