Vaan's Mana Cultivation Path
Of course, it's not like there was absolutely no way for wizards to regain their manhood. The only issue was whether the solution was acceptable or not.
After all, it was hard to say whether the seeds produced from their transplants were truly theirs or the original host.
It was a debatable topic based on perspective.
That said, there wouldn't be any mental barriers if the transplantation involved their own severed manhood. It would just be reattaching what was lost.
However, Vaan doubted all wizards would have kept their severed manhood, let alone preserved in good condition.
Anyhow, transplantation was just the most straightforward method.
If one took the boundless potential of magic into consideration, it was definitely possible to regrow broken limbs and organs with higher-rank healing magic.
However, it would require an extremely-skilled healer with a complete micro-level understanding of the human body.