They are eager to get it over with. The lower desire partner initiates the shift to whatever act might draw the encounter to a close as soon as possible.
They end foreplay quickly in order to engage in intercourse so they can be done. So they can finish.
Why not make the sex desirable and irresistible, like you do with a meal?
Eating can become a sensory delight, and it changes the experience of meals entirely- same thing with sex.
Imagine the luxury of sitting down to a leisurely meal, in which the dishes reflect your particular food preferences.
Compare that to eating a big Mac as fast as you can.
Do you want to linger over each bite or devour the whole meal? You have to cultivate your gourmet cooking.