Responses

The FL is ice, the ML is heat. FL has ice powers on par with ML, but cannot control them well.
When "traditional" methods of warming her up during an episode happen, he has sex with her. He doesn't go straight to it. Sometimes, just him being next to her, rubbing or touching her, works.
It's when she turns into an FLicle that he does the dirty deed. It makes sense, when you think about it; if she needs to warm up, it's better to start from the inside, out.
So, like I said, the smut is not gratuitous and has a functional use.
Stupid translator group.
If you notice that chapters in this title seem to be missing, chopped up, or short, that is because the translator group is removing the s*x scenes.
This webtoon is a sm*t. To lower the audience rating, they've removed all s*x from the chapters. It's not gratuitous and actually has functional meaning to the plot.
Unfortunately, no other group is translating this into English at this time. If you want to see it's original format, it is translated in Indonesian on /b. The mods on /b do not allow this kind of c*nsorship, so it isn't posted there in English.