Promises! Promises!

Sandy Brooks (Mansfield) is desperate to get pregnant, but her husband Jeff (Tommy Noonan) is too stressed out to make love to her. They go on a pleasure cruise and meet Claire and King Banner (Marie McDonald and Mickey Hargitay) Both couples set out on a drunken spree and end up changing partners when retiring to their rooms. Later both women discover that they're pregnant, and set out to find whether the fathers are their own or the other's husband.