[Out_of_Characte]

Biologic incompatibility isn't as much of a concern. At least not with the modification in the article. Our genes encode a wide variety of proteins and enzymes that differ from person to person. Even people with significantly debilitating mutations havent had trouble conceiving. Even people with extra x or y chromosones do not have to worry about the matter. Though some men do have strange mutations like only being able to conceive girls with their partner.