Cultivators don't really pursue women, as they are easily obtainable.
However, this Nascent Soul Powerhouse hadn't achieved the Nascent Soul Realm when he first met Mei Xianfu.
He was just a Hua Hualang back then, not particularly down and out, but compared to Elder Mei and Mei Xianfu, he indeed had no status and was very lowly.
Additionally, the situation in the Southern State is special, where male cultivators have always been beneath female cultivators.
Now, having flipped his fortunes, he naturally wants to ride on the backs of female cultivators—it seems a human nature.
In short, this Nascent Soul Powerhouse wants to hold his head high by sleeping with the woman he once could only look up to. And isn't that the way to hold one's head high? Moreover, the woman he needed to look up to back then is still young and beautiful today, not some old crone. What's not to like?
