Romance is like the ignition system on an engine. If the timing isn't just right, the engines of love won't start. As the pistons in the engine move up and down in the cylinders, the spark plugs spark, the fuel burns, and the engine runs. If the dwell is too advanced, combustion happens too soon, and the engine pings. But if the dwell is too retarded, combustion happens too late, and the engine will sputter.
Love is a lot like that.
Only, romantic dwell is the amount of time a person spends thinking about beginning a relationship with someone else before deciding what to do. If the timing is right, sparks fly. Unfortunately, the timing is usually off because most men are romantically retarded, while most women are romantically advanced. Most women want romance and commitment to happen immediately after they decide they are interested in a man, and they use sex to accelerate this process. This is because most women have a shorter dwell and a more advanced romantic spark, while because many men feel they have more to lose, their dwell is usually higher.