Okay.. I'm gonna give this a shot.
The only thing I can ever really tell you is how I relate these things to my situation, and my kind of love.
I believe that no one can ever truly, completely know another individual, or speak for them. We can only make educated guesses, based on how much we have learned or experienced with that particular individual. Therefore, we can only ever truly know what we feel, and think... and we have control over non other than ourselves... (some of us not even that... but that's another discussion.
That being said, we can never speak for another's love because we can not truly know it. We can only go by what we're told and shown. I would say no to the fact members have to be in agreement to experience consumate love. I believe that I could love someone in a complete and whole way and never have that love returned to me the same way. ... sadly.
As far as passion is concerned, well passion is a feeling, and feelings are physical. So I don't believe you can seperate passion from your physical being, however I do believe that it's up to you how you express them. For instance, when I feel passionately about something perhaps someone has written or said, I get this feeling like, "Yes!!! Absolutely! I know exactly what you mean!"

But that doesn't necessarily mean I want to jump their bones.
Then as far as commitment is concerned... well that is also individual in my opinion. I am actually having my own dillemna with this particular "facet" of love. I suppose it depends on how much you value your word, and the situations that cause you to question your initial commitment. I think that we as humans have tried to define with words our levels of commitments and they all sound nice and clear until we realize that life is full of shades of gray. In my mind, I thought I understood what "for better of for worse was" and I assumed that I had deal breakers.. things I just couldn't get passed. I want to say that I believe if one person breaks the terms of the agreed upon commitment it gives the other person the right to walk away as well. But that is not how I feel at the moment. I feel like the honesty of the matter is I gave my word, and committed to it, body and soul. I have loved and given unconditionally and I do not see how I could ever go back on that. I know that I can be alone, I can do this. In some ways I was even made for this. And maybe I could even be happier if I walk away. But I feel like it would be a betrayal of who I am. And I didn't realize until I was faced with this situation that my commitment ran this deep. And no, I don't believe it is reciprocated. If the shoe were on the other foot, he would have left me without thought or hesitation... which is why he expects me to do the same.. but that isn't who I am, even if I thought it was.
I don't know if I'm making any sense, so I will try once again to clarify.
In my opinion, commitment is individual and depends on how deeply you love and care for the individual you're committing to. And commitment may be "defined" by words but is only ever clearly understood through action.
Sorry if I made no sense... :\