SAN DIEGO — College students have heard a similar refrain for years in campaigns to stop sexual assault: No means no. Now as universities around the country are facing pressure over the handling of rape allegations and are adopting policies to define consensual sex, California is poised to take it a step further. Lawmakers are considering what would be the first-in-the-nation measure requiring all colleges that receive public funds to set a standard for when “yes means yes.” Defining consensual …