Talk:Mermaid/@comment-39280634-20200306184646/@comment-27045866-20200306191937

It's unclear. According to the Q&A:

"6) Some questions came up after reading the previous answer. Why would there be races breeding with humans back during the previous system?[7]

''    If it's just for having children, then monsters normally abducted human girls for breeding them, or males in case of Lamia and Harpies... or something like that. Of course, there was no love involved in this and the humans would normally get eaten after the child is born. However, there are lucky cases where the monster would awake to feelings of love and affection and become joined with the human as something like a married couple. It seems this often happened with types close to humans, such as Vampires, Succubi, Beast-types, Lamia and Harpies, or high ranking monsters such as Dragons or Baphomet."''

He has said that some breeds like Lamia and Harpies (I would assume, like some mythology in the case of the lamia which aren't even snakes in the original Greek, could have had a human upper half in the previous era) would breed with men in the past era and sometimes even fall in love with them. It's unclear if this would include Mermaids, but it could. Although without the influence of a succubus demon lord they may have not always been attractive.