@danknny IIRC, the "4 pages" joke/meme came from Kaguya...
...where Ishigami mentions that a certain manga magazine (probably the one Kaguya-sama runs in) allows for up to 4 pages of sex (ya know, as long as it fits with manga standards, you can't really draw genitals).
So when people joke about a couple going to have sex, they talk about the manga getting it's 4 pages.