Before marriage, a girl has to make love to a man to hold him. After marriage, she has to hold him to make love to him.
This could be done in part, because the equipment was very inexpensive. Not much money was involved in tooling so that basic changes of that type could be accomplished.
The thing you can't let go of is gravity. The reality of gravity in writing. If someone says something really mean in a sitcom, and the next wave isn't a reaction to the reality of that, you start losing relatability. In a lot of romantic comedies, they throw out the rules of life.