preparing for anal sex irl is much more complex than in these manhwas. you’ll need to fast before the deed or you will genuinely shit on your partner hence i always find it funny when in manhwas they eat a whole meal before getting down to business. you also need to do douching before anal.(douching is pushing water in the rectum to wash out any poop) only manga that comes to mind that actually acknowledged douching is link and ring.

FUCK MY BRAIN IS ROTTING BECAUSE OF OMEGAVERSE THAT I TOTALLY FORGOT THIS ISN'T MPREG AND PANICKED THAT THEY ARE DOING IT WITHOUT A CONDOM.
on a side note to all the irl bottoms after you do the deed , does your poop like slide through .....? i'm sorry if its offensive but I genuinely lost sleep thinking about this