Talk:Sandworm/@comment-24862435-20150712125334/@comment-78.20.131.40-20150712130120

Some Mamono (especially Succubi) do sometimes attack human women. Mostly for fun, or to relieve sexual stress if they can't find a male in time. Though usually the human woman will become the same species as the Mamono that attacked her.

And for your second question, pretty much all mamono are bisexual to some degree. They have no problems doing it with another woman or mamono to relieve sexual frustrations or have a threesome with their husband. It's just that, despite being bisexual, mamono are heteroromantic. Meaning they only want a romance with somebody of the opposite gender.