If you don't take the cum out of your bowels, it can lead to symptoms like indigestion. That is what it is referring to. Sometimes people don't do aftercare and fall asleep right away. Also with straight sex, you should pee before and/or after to avoid UTIs. (⌒▽⌒)
It doesnt hurt when it happens but after cumming inside your stomach starts to get upset and to hurt
Its more the aftermath so you have to clean it very well but you cant get everything out
The stuff can cause the tissue inside to cramp up if you don’t clean it out properly
But I’ve never been able to put two and two together - why does it hurt to come inside???? Lolllll