I prefer consensual M&Ms

Judge in Craigslist 'sex-slave master' John Hopkins' case says consensual S&M can be criminal
S&M can be criminal even if it’s consensual, a Brooklyn judge said today during the arraignment of a self-described Craigslist sex-slave master.
Erm, no, that's not what the judge said. He said that just because someone agreed to indulge in sado-masochistic activities doesn't mean that nothing that follows can be considered criminal. It's no different from the law regarding "normal" sexual activity. It can start off consensual but become criminal.