To Sumerians, Babylonians, Assyrians and Jews there were male and female demons (Jewish demons were mostly male, but Lilith was female). In Christian demonology and theology, although the belief in incubi and succubae is accepted, the matter of the sexuality of the demons is not so easy.
Gregory of Nyssa (4th century), as well as Ludovico Maria Sinistrari (17th century), believed that there were male and female demons.
Authors that believed in demons of opposite sex assigned them a heterosexual tendency, even if seducing people by means of pederasty; the only demon with a bisexual tendency, and solely for some demonologists, was Asmodai.
But most demonologists did not recognise that there were female demons. As they always referred to demons as "he" (or equivalent) in all Indo-European languages it has to be supposed that they believed only in male demons, as well as angels were only male. This patriarchal mentality that banished completely the idea of female supernatural beings in Heaven and Hell led to another conclusion. As incubi and succubae existed for Christian authorities, demons, including the Devil, could take the shape of a man or a woman to act as an incubus or a succubus. So, they were attributing to all demons what today is known as a bisexual tendency.
It is licit to think which conception should be more appropriate, if demons of both sexes with a heterosexual tendency or male demons with a bisexual tendency. Perhaps, being that Christianity attributes all sins to demons, and all non-heterosexual tendencies are considered "sins" by it, demons should be of both sexes and their tendency bisexual, and there should be even homosexual demons of both sexes, but nobody considered this possibility for them.
By supporting the idea that demons could rape women and sexual relationships with them were painful, Nicholas Remy assigned a sadistic tendency to their sexuality, meanwhile most demonologists considered it pleasing.
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