It depends on the definition of “nothing.” Typically one would go out on a few dates, typically 3-5, until one of the people (usually the guy, but can sometimes be the woman) confesses. However, any forms of intimacy beyond simple flirtatious gestures are normally considered off-limits until both people agree to be in a relationship, such as kissing and even hand-holding. Granted, I’m speaking in terms of broad cultural norms; individuals may choose to do differently.