MC in cultivation novel has to "cure" FL of her poison through s*x. This is a forced plotline when MC and FL have difficulty getting together morally or emotionally or because of extraneous circumstances, and leaves a bad taste imo.

In this novel, what happens is at some point the MC discovers that he has chosen extreme yang techniques to cultivate and thus needs a cultivation partner to offset this, which should've meant s*x. This is hinted at very early, and MC manages it alone for some time until it can't hold on its own. Still, he doesn't actually need to have s*x, only to receive Yin energy through his meridians, which his non-biological sister happens to have in abundance. This gives a pretext for them to sleep in the same bed (without any abnormality) and remain close.

This gives rise to some funny situations and inner monologues from FLs, as well as giving some steam to the harem and romance. Without ever having to actually break that barrier and become r*pe or decisively tying their boats together. It actually felt like a good plotline

My biggest problem with the MC is the child-predatory vibes he gives off when he finally meets a girl named Xu Xiyue in Chapter 368. To give context, the MC was reincarnated into a fantasy cultivation game he used to play, which is how he knows he is cannon fodder, since the in-game version of the character he reincarnated into died. But when he was playing the game back on Earth, he was obsessed with this NPC named Xu Xiyue, who was a waiter in the Cold Sky Country of the Western Region. He was even calling her his wife even back then. That itself wasn't much of a problem to me. The problem is that once he meets her for real in Chapter 368, she is a 12-year-old girl while he is a grown man. Usually, a normal person would've probably moved on and said it wasn't meant to be, but not this MC. He doubles down and starts staring at her like some creepy stalker, tries to give her cultivation techniques to make her like him as if he's a man in a white van handing candy to unsuspecting children, and even sneaks into her room in the middle of the night when she's sleeping to transfer energy into her while also reading her personal diary. And you want to know what the worst part is? Before leaving, the creep actually proposes to her! He even admits part of the reason he came to the Cold Sky Country of the Western Region was specifically to meet her. He is even bribing her with cultivation techniques just so he looks good to her. Isn't he just trying to groom her at this point? And none of the other girls make a big deal about his behavior either. It's briefly mentioned by Xiao Yunluo how she's only 12, but then it's brushed under the rug like he isn't some weirdo. I don't know what the author was thinking with this plotline, but it's really disturbing. I can have a suspension of disbelief when it comes to the Old Loli since I know she's super old, but not with this.