University campuses across the country are trying to change the discussion about sexual assault among young people by changing the conversation about consent. For many years, the phrase "no means no" has been the slogan of sexual assault prevention groups. Now these advocacy groups are flipping the script, literally, to incorporate a "yes means yes" campaign instead.

"The swiftly evolving conversation about defining sexual assault signaled to us that we needed to reframe our name as something more positive," Allison Korman, the Dartmouth Summit on Sexual Assault executive director, said. "And it's even possible that 'No means no' will be an outdated or irrelevant concept in 10 years. Students may not have even heard of the phrase by then."

Besides the desensitization of "no means no," the new catchphrase marks a change in how colleges are approaching consent rules on school campuses.

In September, California passed legislation shifting sexual assault policies on college campuses to place burden of proof for consent on the accused instead of the reported victim. The law now states that consent must be "an affirmative, unambiguous and conscious decision by each participant to engage in mutually agreed-upon sexual activity," a confirmation that is "ongoing."

With these rules in place, the absence of no does not give consent, nor does a person who gives consent but is intoxicated.

While California is the first state to pass such a comprehensive consent law, but other states like New Hampshire or New Jersey are considering similar bills. The potential legislation ties state college funding to incorporating affirmative consent policies at educational institutions.

The State University of New York system adopted a uniform consent definition on all 64 of its campuses earlier in October. Every Ivy League school except for Harvard University has adopted an affirmative consent policy in one form or another.

"There's quite a surge in support of a 'Yes means yes' formula," Ada Meloy, general counsel for the American Council on Education, said to PBS. "It's certainly an ongoing movement, and is likely to be a generally positive thing. At the same time, it's not easy to develop a good definition of affirmative consent. We wouldn't want a one-size-fits-all approach for a variety of institutions."