I think it's fun and sexy to write and read, if you don't consider the actual logistics of fucking in a shower which can be not fun and unsexy SDJGNJSHG (ง ื▿ ื)ว I think I've only written it in detail for domseok (and I just wrote a shower bj scene for the watersports fic) but otherwise I've kept it as more in-passing sex scenes for some of my syongsyots iirc. it can be difficult to write well, but I think being wet is hot so I am overall team YAY SHOWER SEX! I like this dolnen fic that is basically just that, too: https://archiveofourown.org/works/59519959