If their horns resembled that of mountain sheep, they would be considered the cream of the crop and deemed worthy of becoming the partners of powerful Dictators.
Apart from their lamb horns and hooves, they resembled any other stunningly attractive female and were often collected by many large factions.
However, humans and demons had very different standards of beauty.
Humans could not appreciate the large lamb horns. They were extremely sharp and obstructive.
Thus, the Succubi, who ended up in the hands of the large factions, all had their horns cut off. They then received the same treatment as sheep raised to become food in that the stumps of their horns were burned to prevent growth. Next, beautiful gems were placed over the healing wounds so that the Succubi fit more with the human standard of beauty.