That’s basically how all smut is. Smut is for the purpose of creating sexual fantasies and stuff, so of course the author/artist wants to appeal to the readers with high standards using guys with six packs and girls having an hourglass figure.
If it weren’t smut, then the girls often wouldn’t be drawn that way
Yesss I noticed that in non-smut romance mangas/manhwas the FL is almost always flat as a board, and often has a complex about it as well LMAO
I do agree that in all the smuts I read with a FL it's the complete opposite though. FLs can only grow boobs when they are uncovered apparently, like plants that grow with sunlight ahahah

Maybe I’m just a hater but I genuinely hate how her proportions are everytime I read a wlm story the women always has perky enormous b00bs and a non existent waist like wow im such a chud