Hitmonleeroy: Nah, in the the lore for MGE (Monster Girl Encyclopedia), the monster girls don't kill, instead they just stick by their "husband" dutifully and ever faithfully and only have sex with their partner (and only him). The Mantis in particular will use her arm scythes to hunt for him, and protect him from any threats that could possibly compromise his safety.
And they fuck him every night, as stated in the lore.
Just think what females do after sex.
Unless you don't mind that is.
And they fuck him every night, as stated in the lore.