From the article The cards are a hilarious way to raise awareness of the problem of brutal sexual harassment at DEFCON and similar conferences. Unfortunately,

From the article The cards are a hilarious way to raise awareness of the problem of brutal sexual harassment at DEFCON and similar conferences. Unfortunately, it will take more than raising awareness to make hacker conferences safe for women. We’re waiting to hear about the first[2] hacker conference to adopt a specific, enforceable, well-planned policy protecting women from harassment – and then we’re going to promote the hell out of it. Did you really just get bored and stop reading when you got to the colored cards? You were already 80% through the thing!