The Love Boat (1977) : 3x27

Isaac is nervous about the arrival of a famous model, who was his classmate in the first grade. The woman tries to use Isaac to make her sports-obsessed husband jealous. Two sisters overhear Janet pretending to fend off an attack by Isaac, and come to believe that a sex maniac is loose on the ship. Two attorneys must keep their affair a secret because they work for the same firm. He wants to make the relationship public and get married, but she experiences doubts. An older woman undergoes a drastic makeover to shake out of her humdrum life, and encourages her skeptical husband to do the same.