Ah, when I say 24/7 I don't necessarily mean being nude or even calling him Master all the time. It just means having him be in control all the time, even though it is pushed a little beneath the surface when necessary (the kids around, etc). Ummm as an example.. I suppose a 'scene sub' would play equal part in negotiating a scene -- when it is done and what is done, at least the basics. There is no 'training' or actual 'discipline/punishment', as there is no ongoing submission. Whereas on the other hand even if the '24/7 sub' could not express her submission openly at certain times, he decides what happens and when. He decides whether or not they play, and what happens in the play (within the sub's hard limits of course). There is also actual 'discipline/punishment', which translates to 'things the sub does not like'. That's my (rather long-winded) opinion of it, at least.

Indeed, hellish one, I totally get your point. I too would feel exceedingly weird if a previously entirely vanilla relationship/friendship/whatever turned into BDSM. Lol.