Hook-ups + alcohol = trouble.
Friends don't let friends hook up drunk.
Alas, the people behind this sign seem more interested in stereotyping men than in doing something to help sexual assault victims. Yes, indeed, this sign would be helpful . . . if sociopaths paid attention to sarcastic public service announcements. Since it's a pretty good bet they don't, why not address the culture of booze-fueled hook-ups that are at the heart of the college sex problem?