Looking back to the 1970s I remember two TV shows that was about love and relationships in a humorous fashion. The two are "Love American Style" and "The Love Boat" Every week they >would change the storyline with different guest stars.
Here is the Opening Theme Song from Season 1. The Theme Song was sung by the Cowcills, who had the hit song "Hair" 1969.
The Love Boat was about love and romance aboard a Cruise Ship. Here is the opening of the Show.