Never be alone in a bedroom with a member of the opposite sex with the door closed. Never be in a house alone with a member of the opposite sex. Sit on the porch or go for a walk till someone comes home. Kisses are the most sacred thing you can give before marriage, so give them sparingly and save the first one for a very special occasion. Set a curfew.
Midnight works well for most people on most occasions.
Take a hike, rake leaves for a widow, try a craft project, clean the house, or play a game. You get some good talking time without letting things get too heavy. No one is constantly reminding you to keep your foot on the brakes in developing your relationship. You have free reign to come to know and understand each other. But eventually the newness wears off.