When people spoke of dual cultivation, most dual-cultivation techniques were methods of harvesting and replenishing: one party plundered the other's true qi to improve their own cultivation.
Of course, there was also a kind of dual-cultivation technique in which a virgin cultivated while the man used their dual cultivation to break through. The woman could only absorb some of the true qi that leaked out and improve her cultivation a little.
Put plainly, this was still a method of harvesting and replenishing.
The yin-yang dual cultivation Wang Yue practiced was different. Its foundation was that when the two parties were intimate, the balance of yin and yang allowed their true qi to flow into each other's bodies. They could draw on the other person's true qi as an additional source of power to break through their own cultivation bottlenecks.
Usually, when someone encountered a bottleneck, it was because they lacked sufficient true qi. But with another person's true qi to draw on, that extra power made breaking through much easier.
Of course, even without a breakthrough, letting the other person's true qi flow through your meridians could expand them and rapidly increase your strength.
Wang Yue had been at the peak of Foundation Establishment, while Dong Xuan'er had been at the peak of the Golden Core stage. So when the two began dual cultivation, Wang Yue first sent his true qi into Dong Xuan'er's body and forcefully helped her break through to the Golden Core stage.
Then Wang Yue guided Dong Xuan'er in rapidly improving her cultivation. He seized the opportunity to keep enlarging her Golden Core, forcibly raising her cultivation to the middle stage of the Golden Core stage before guiding her true qi into his own body.
One of them was at the middle stage of the Golden