Orc's had a burning to spread their seed in as many females they could get their hands on, the individual orc sperm cells were extremely large and aggresive just like the orc's themselves, it would effortlessly destroy the seed of lesser races, the outer defensive layer of the ovum that most sperm cells struggle to penetrate might as be paper for the orcish seed and it could even sometimes terminate early pregnancies in the womb. That isn't even mentioning the vast quantity of seed the enourmous orc testicles produced. It out performed human sperm in every single aspect both in quantity and quality. When an orc comes in you it is over, he will fill your womb to the brim and no amount of magic or medicine can prevent, remove or terminate orc seed once it has been sown. The potency also overrides the genes of any other race, it dont matter if you are human, draenei, elf or anyother race. The child grown from orchish seed will be a pure orc with little to no traces of their mother heritage. It is one of the reasons there are no "half-orcs" because every orc born from a human woman (which have been the orcs favourite breeding slaves since the first war) is simply just an full-blooded orc.

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