This quote suggests that humor can help people to express themselves more openly or comfortably than they otherwise might. In other words, humor can make people feel more at ease or relaxed, so they are more likely to talk about things that they might not normally discuss. For example, if you are in a situation where you feel uncomfortable or embarrassed, humor can help you relax, making it easier for you to talk about the topic. Humor can also be used to lighten the mood and make conversations more enjoyable.