Board Thread:Questions and Answers/@comment-86.136.11.218-20160216122953/@comment-10733658-20160216151915

The answers to most of those questions are pretty obvious. There are multiple examples of humans and ghouls having close relationships:


 * Yoshimura and Ukina - lovers
 * Nishiki and Kiki - lovers
 * Touka and Yoriko - best friends
 * Tsukiyama and Chie - best friends
 * Ikuma and his human mother
 * Shachi and his teacher
 * Uta, Asa, and Tsumugi were all friends
 * Koharu loved her adoptive father, in spite of him abusing her
 * Donato and on's super complicated relationship
 * Eto and her editor

Eto is clear evidence interbreeding is possible. Itori claimed conception is difficult, so it's likely there's some major differences. In general, the further seperated two species are the more difficult reproduction is.