The act of sex is not illegal. But if two members of the American Law Institute have their way, it will be — unless you follow their rules.

Law professors Stephen J. Schulhofer and Erin Murphy are trying to update the criminal code when it comes to sex offenses, believing current definitions of rape and sexual assault are antiquated. The focus of their draft is on what constitutes consent. It adopts the “yes means yes,” or “affirmative consent” model that was passed in California last year.