Which position is the most energy-saving for men during sex (adult novel about sex knowledge)

It is more energy-saving for women to be on top.
If the husband is tired, in order not to increase his fatigue, the most commonly used position is that the woman is on top. In this method, the man only needs to lie on his back, and the initiative of sexual intercourse is in the hands of the woman, which allows the man to complete sexual intercourse without consuming any energy. There are also various variations of the posture for the woman on top. First, when the man lies on his back, there are differences in whether the legs are closed or open. For women, some options include supporting their elbows on both sides of the man, or placing their wrists upright on both sides of the man, or sitting completely on the man with their knees upright, etc. The most intense one is probably the one that straddles the man's waist, making him sit up straight and move his waist up and down. This position allows the penis to penetrate deep into the vagina. As the uterus descends, the glans can directly stimulate the uterus, giving both men and women pleasure. Since the man maintains the same posture from beginning to end and does not need to move, this is a posture that can satisfy both parties when the man is tired.
The forward sitting position is also a very commonly used position. Another position that can be used when the husband is tired is the front sitting position. The man and woman face each other, the man sits down with his legs stretched out, the woman sits astride the man with her thighs spread, and they hug each other. This is a comprehensive skin contact between both parties, so the stimulation is very strong. The two can chat face to face. The sexual intercourse is done by the woman, and the man only needs to maintain the same posture. In this situation, the man puts his hands behind his back and the woman is entirely responsible for the movements. After the penis is inserted into the vagina, the woman also puts her hands behind the man and stimulates him by raising her hips. When a man puts his hands behind his back and lets the woman manipulate him, it always makes the man feel unsatisfied. At this time, the woman also puts her hands behind the man's back and stretches her legs forward or bends backward to unite the genitals, which facilitates enhanced stimulation and thus can achieve greater pleasure. Moreover, in this posture, because the center lines of the penis and vagina intersect, the woman moves slightly backward, just like a flagpole falling down, which can give the man an oppressive stimulation, eliminating fatigue and obtaining intense pleasure.
The reclining position is relatively labor-saving. This is a posture in which the man sits with his hands behind his back and the woman sits on him with her back to the man. At this time, the female's vaginal opening faces backwards, making it easy for the penis to be inserted, and the female's movements are more free, which is suitable for when the male is tired. The disadvantage of this position is that they cannot see each other's faces and therefore cannot talk.
The side-lying position can be easily chosen. Another position that men like is lying on your side, where neither of you needs to put your weight on each other, and the man can penetrate from the front or back. Since you don't have to bear the other person's weight, it is suitable for use when you are tired. This is an appropriate posture that can be enjoyed as soon as contact is made, and the pleasure can only be enjoyed if the posture can be maintained for a long time. Both men and women can use this method when they are tired. The disadvantage is that the insertion depth is shallow and sufficient stimulation cannot be obtained.