in developed countries?
obviously this wouldn't happen in real life, but if you were a leader, what if there was like, a couple really into BSDM? (especially the BD part).
The sub would want to be recognized as a slave to his/her's master or dom, and as such would be recognized as a slave and would have reduced human rights, he/she wouldn't be able to interfer financially in terms of their dom's property unless of course the dom was in some kind of legal trouble (in jail) or among the like.
Along with the reduced human rights would be complete ownership to the dom, the sub can be treated legally as what the dom wants, whether it be something sexual or just being degraded.
The only exceptions to this rule are that the sub cannot be severely maimed or killed, the sub if need be due to emotional stress, mental, and/or physical stress has the power to legally get out of this label of slavery as easy as he/she got into it. The couple also cannot perform any "degrading" actions in public where it wouldn't be normally concerned acceptable to commit severe acts of the like. (I've seen of stories where doms take their subs out naked with various objects sticking out of their asses and walking like a dog, that kind of stuff shouldn't be accepted in public because several people as of right now consider it taboo)
The thought of this crossed my mind when a friend of mine who was researching bdsm linked me to an article about it