From: Davis, Ca
the only thing that i believe to be "out of bounds" in ANY relationship are things that occur non-consensually.
within the context of a BDSM relationship, that to me means that it is something the submissive partner has revoked consent for, or spesifically refused to do in negotiations.
however, for me this also applies to those not in the relationship. i think that non-consensually invovling ANYONE in ones sexual expression is a not-good thing. ex- visibly having sex in a park, doing things in a place where one could be easily observed, beating a submissive in public, forcing a submissive to kneel or not use furniture in a public venue where this is inappropriate eg. a resteruant.
this, to me, does not apply to collaring and leashing a submissive or slave, because that, to me, is analagous to holding hands. :)
so, to me, anything is within bounds for ANY relatonship as long as there is consent from all parties invovled.