First let me say that your description of their home and how it functions reminds me A LOT of H's home. Remember, he was raising several teenage boys/young adults at the time. Our home still has vestiges of this like my H's waterbed that he just loooooooves and will never get rid of. There is nothing that beckons the cow more than a couple of "helpless" males living their version of the "good life" especially when they are so pleased by the tiniest gestures - baking some cookies, wiping a counter, helping choose something for the house. All of these things hooked me in like I cannot tell you. In many ways that has been a good thing. My children from my previous M have certainly benefitted from my H and I meeting and marrying. Your desciption just brought a lot back.
Also, clearly it takes a very secure person to allow another to "rummage through" their sexuality but I think it is a great description. I had always hoped for something like that as well. So, it sounds like you are comfortable with being exclusive in this relationship for a while???????????? Do you think it is soon for that?