Editing Monster Girl Encyclopedia I (section)

===Relationship With Human Men===

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Monsters form married couples in the same way the humans do. Since there are only females, they do of course take human men as husbands. To monsters, being husband and wife isn't just about emotion and contract. When they really like a man, their interest and desire towards him surges. They start to greatly prefer his scent, and the particular taste of his essence. Put another way, their interest in other men dwindles, and they start to wanting only that man as their male. In such a situation, their instinct has recognized a man as being their husband. Because of this, even though the monsters have extremely high sexual desire, and are dedicated to the pursuit of pleasure, once they've settled on a man as their husband, they whole-heartedly attend to him, treating him even better than they treat themselves. 

Regarding the reason why they have these traits, it has been said that “it's that way so that they don't fight over prey with other monsters,” “further charming a man results in more stable essence production, as well as higher yield,” etc., but it may also simply be explained that the personality of the current mamono lord who changed their traits is showing up in the instincts of the monsters. Also, perhaps for the same reason, they tend not to attack men who are strongly stained with the odor and mana of another monster. However for some races, it's fundamentally accepted that a man will have many wives, and he'll just keep having sex with the many monsters who love him one after another, or perhaps keep going with several at once. He would have to offer a huge amount of essence. Furthermore, depending on the monster, there are some that treat men as prey or slaves, but in this case, prey or slave means the same thing as husband. In spite of the words used, a strong love can be seen through their attitude toward and treatment of their men.}}</div>