to answer your eg Ozme yes, i would probably not to put too fine a point on it have totally freaked out and gone f****g mental lol in fact i think i still would if someone did it to me other than in play, now strangulation is one of my favourite things but it was done when I felt ready for it.
i can see what you're getting at (i think) and can appreciate what you're saying and agree re communication but for some people there are somethings that no matter how intimate you may be with a person no matter how important you know communication should be that are too painful and personal to disclose for a long time if ever and very often those things are of a sexual nature which is why i believe that the pushing of hard limits should be done with extreme caution and when all concerned are in a very clear frame of mind.
ok in that particular instance why i didnt tell him about it i dont know, it wasnt exactly a major thing to hide, but i couldnt until much later in our r/ship im human and human beings very often put emotion before communication and logic.