User blog comment:Cococrash11/Hollows breeds with humans/@comment-1268838-20100502040155

I'll say my piece, since this seems to be getting kind of crazy and the topic is interesting. Let's face it - every Shinigami, Hollow, or whatnot in the series is dead. A spirit or whatnot. The series has clearly established that a certain boundary exists between Shinigami and Hollows - the fact that this line can be crossed both ways shows that one or the other, the two races are connected in some way. Both races are "born" from a Plus, so dead or living is not the problem here. As for the Arrancar thing, I have mixed thoughts. If an Arrancar is indeed a Hollow with Shinigami characteristics, it isn't entirely impossible for them to have similar if not identical anatomy. After all, they both have that "soul sleep" thing, which maintains the same general position on either race's bodies. Considering this, there may not be a difference between the anatomy of their souls and bodies. However, the way some of these Arrancar's Hollow holes are placed completely screws over any thought that their organ structures are the same. Those are generally facts, but to speculate, my guess is that Arrancar have reproductive organs since they are taking on Shinigami characteristics. I'm not gonna touch on the issue of whether they would be able to use them or not (nor is there any chance that this will ever be confirmed or not).