Society changed a lot since Biblical times. They didn’t “live together” in the same house, but these people certainly “lived together” in the same street or village before getting married. People didn’t really have a lot of “home life” like we do now, they’d be out in the fields, or cooking in front of their home. So they’d see each other’s home life and it’s more “getting a house for themselves” than a big change in privacy or contact hours.