>>8726246
It depends, I mostly see the incest ones where the concept is really icky, or it's NTR, or it's just... I can't get aroused because the environment of the doujin isn't exciting to me. Sometimes the male lead just looks average or is a big and chubby older guy, but you can't even see his face, and the focus is on how "disgusting" or old the girl is.
That's why I can't get into it, personally.