Bumble is changing one of the rules that has defined the dating app since its launch: either person in a match can now send the first message. Bumble is also extending the time available to respond from 24 hours to 72 hours, which should make it less likely that a promising match disappears simply because someone was busy for a day. Bumble says women still have the option of making the first move, but its research suggests many, particularly Gen-Z women, also appreciate having the flexibility to let men start the conversation.