Unrealistic Sexpectations

Im curious. name the mangas where you went like "hold up, theres no fucking way these people are still fucking" hahahahaha essentially mangas have long ass sex scenes that are way too fucking long (you know when the segg reaches 2 fucking chapters) that theres no conceivable way its possible in real life and makes you question the bottom's well being.

ill start!
1. K's secret

any genre straight/ or gay

im curious in which genre this shit is more prevalent