The sex session they just had was to sum it up in one word, "Wild". Andrew who could boast of his great stamina had to admit that the barbarian woman's libido was not something any human could endure.
What Andrew didn't know at the time was that there was an explanation for that and it was all due to race. Not only are barbarians born warriors, but their physical capabilities are the strongest among all races on the continent.
By this, he did not mean that they were the most powerful, but rather that their physique was abnormal. The muscles and bones of barbarians are naturally stronger and more resistant than those of other races, so, in the sexual sphere, they are also very powerful.
Even though Andrew had already released the second divine seal, he was still a little behind in terms of sexual stamina compared to the barbarians and that was why he was so tired.