After The Fall
Maailma knows nothing of microscopic organisms or the science of genetics. What it does know about is spirit and heritage.
Procreation in Maailma is not a matter of sperm fertilizing an ovum, but a mingling of spirit in which something new is born. Physical being reflects one’s spirit, and therefore physical features are passed on in this process.
Sex and sexual organs are the means by which this mingling of spirit is achieved by mortals in the physical world. For other creatures, and in other domains, the same rules do not necessarily apply.