British law does not recognize the possibility of consenting to bodily injury. Such acts are illegal, even between consenting adults, and these laws are enforced. This leads to the situation that,...
BDSM (Bondage and Domination, Sadism and Masochism -- or less commonly Slave and Master) is perfectly legal in the US provided both participants are of legal age, the sex is consensual and it's done...
There is no such thing as legal weed in the United States. There are state regulations that allow medical marijuana but on a federal level it is still a crime.