In an instant, his Dual Cultivation Body erupts. The immense power of lust and pleasure enters his brain. This was the full reaction of his Dual Cultivation Body. He normally doesn't activate his Dual Cultivation Body for this kind of stuff.
But, this time, he had no choice. He wanted to control his breakthrough but he also needed to comprehend the Elements. Even his sword energy wasn't successful to press his cultivation. That's why he used Dual Cultivation Body.
As soon as the power of lust filled his brain, his eyes turned greedy for sex. But, his Sword Heart instantly released the pure stream of sword energy and calmed his head down. After all, Sword Energy was much more capable of the calming head than the body.
After the power of Dual Cultivation Body erupts, it released another wave of pleasure that didn't reach his mind rather entered his dantian. This sense of pleasure creates a barrier around his dantian, forcing the overflowing qi into a state of calmness.