Well first off I am not the one drawing the line, my Owner is.
lol

He has the line drawn at directly involving others who are not in our circle of friends etc beyound a certian point; or playing with me in such a manner that would jepordize my safety as his property, or in any way that would reflect poorly upon his auctoritas and dignatus.

For instance, at a goth bar I may only be cuffed, leashed, publically kneeling, etc only light bondafge references, though lots of fettish wear sometimes/ but when in some other appropriate enviroment (some SCA functions, bdsm cons, fettish balls, private homes or clubs etc) one may find me in various states of more serious "humiliation play" publicly leashed on all fours, exposed, slaped, spit on, used in plain site and or shared or made to "preform".

What extreme is reached during any of the above will have a lot to do with his personal preferences at the time and what he considers to be appropriate for the situation.

Being a very kink private person, I do know that he doesnt wish for our fun to be made known to our family or non-kink friends or employers etc; so quite naturally he doesnt ever take me for a "walk" out on the open street naked with a cherry red butt plug protruding from my ass and the words "cum dumpster slut $5 fuck any hole" written on me, or anything like that.

Now for as when I was a submissive it was for the most part very similar (though I was a wilder child back in the day so sometimes it was a little more raunchy and very public at times) but was basically alllways something I felt as if I could stop or say "NO" to if it made me uncomfortable. (this is of course not counting those times when my trust was violated against my will)

So basically for any submissive I would say, once the humiliation reaches a point at which you are no longer turned on or comfortable by being humiliated that perhaps you should consider putting a stop to it.

Saying no at anytime during play or otherwise not withstanding; one should be establishing hard limits about humiliation up front, just as most people may not like skat, animals etc etc involved in their bdsm life they may also wish to avoid certian levels of humilation and or exhibitsion etc.

Other than being just plain exciting (I am a big time humili slut) humiliation is also sometimes used as a training technique to help confer focus and trust unto one's submissive and or potential slave. By repetition in different scenarios a sub builds trust in his or her dominant, when the dominant in question doesnt force the sub to go beyound those preagreed levels. Focus is achieved as well, during humiliation play, unless a dominant is being indulgent, or simply prefers to see their sub plead and baulk at some commands, the sub eventually can learn to stop worrying about the eyes of others and focus on their dominant and the task at hand instead.