#3 sounds reasonable to me (perhaps we could add "metal wire" as in barbed wire or uncoated low-current electric wiring?)
#5 is a bit vague. Technically many bondage tools can endanger the wearer's life or future health if one is not attentive or if an accident happens. If you're hooded, gagged and hanging upside down and you suddenly sneeze heavily (not implausible), that might choke you because the nose is the only air canal you have and if it's all blocked by mucous snot (urgh!)... There are certain spots near the collarbones that, if pressed, will make you go unconscious: sometimes people in agent books kill that way. And obviously breasts can be damaged for good by being treated the way they have been in the main thread. What if we say: the applying of a restraint or a "stimulant" must not have as a clear key goal to risk killing the performer or impairing her body for good?