As I was reading through this, I was very... this:
and then I was getting closer to this:
Let me add my own two cents in. I am very... hesitant to have this added It seems almost superflorous. Seriously, tagging and marking a concubine? That's not ISA duties. Heck, I'm not even sure why the person cannot be bonded in a normal ceremony as they would be considered (lower-class) mates. To take up an equipment slot for a mate? That's just silly. They become property? That's what the slave roll is all about. I could talk about the actual history of the concubine, but this idea seems to be of the idealized/popularized view of the harem, so it's probably moot.
Those who become a slave and then complain about how restrictive the position is completely miss the point. Slaves ARE property. They may be precious and valuable to the owner, but at the end of the day, they are nonetheless items to be used. They can be cared for and nurtured, or they can be ordered by their masters to be a doorstop. Owners and slaves current and to be need to recognise and remember this fact. If those restrictions are not your cup of tea, then make the slave a secondary character and create a free person.
The idea that concubines are property as well seems moot. That they would have more rights even as property seems to defeat the purpose of them being property in the first place.
On the bonding, well, It could be summed up as follows: Hahahahahahahahaha!
No.
Seriosly? There are hundreds of characters in the game, and not even a handful of churches established here. Not everybody follows them, but their own personal gods of their homelands, or no gods at all. By saying that in order to marry, you MUST marry in by at least one of the pair being part of that religion, that means that say, those who don't must convert or not be recognised.
Eff. That.
Additionally, this one bonding rule seems to be in order to shoehorn in concubines just so that it can be a viable option. That is poor planning. First off, some of the races practice multi-bondings, either out of necessity (catfolks' lopsided gender births), tradition (torians' life style), or personal culture (humans in various locations (RL evidence)) as examples. Personally, I would see RP limitations itself would control this naturally--we would only bond with those we were extremely close to and spend most of our time with; the more mates, the less time you would have for each and the more stressed the bonding becomes. Besides, as I once joked in the game, "Having two wives just means getting told, 'not tonight; I have a headache' twice as often."