'Yes means yes' college sex assault bill

California Governor Jerry Brown on Sunday signed a law requiring all state colleges to adopt a policy of unambiguous, affirmative consent by students engaged in sexual activity, part of a nationwide effort to curb sexual assault on US campuses.

California's so-called "yes means yes" law will be the first in the nation to make affirmative consent language a central tenet of school sexual assault policies, proponents said.

The legislation, passed by the California State Senate last month, defines consent as "an affirmative, conscious and voluntary agreement to engage in sexual activity."

It also states that silence and a lack of resistance do not signify consent and that drugs or alcohol do not excuse unwanted sexual activity.

The White House has declared sex crimes to be "epidemic" on US college campuses, with one in five students falling victim to sex assault during their college years.

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