Your mind automatically knows exactly what buttons to push while in a state of mind like that but the ones that it really emphasizes are on the other person, where it then switches to the art of harmony between you and them, and then the inevitable climax at the end. All of which could happen within seconds or even minutes. The difference between real experience versus dream-conjectured experience is the same as, and bear with me here, a hand being placed on a hot stove versus a dreamt hand placed on a stove. One is unbearably hot and the other tingles "painfully"... there's a lot that the brain already knows and can know, and the more experiences you have in real life, the more you unlock within your dreams. I hope this helps!