Many people were disillusioned with sex and magic. They misinterpret the actions of the universe, as controllable to them through many misguided actions.
When I read of the myths, I read what the myths represent.
Sex is added for those that are using myths and magic for ulterior motives, not for those that are seeking the origins of myth for the origins of astrological and universal truths.
All sorcery is sin according to the law of God, and it is wicked spirits that are given authority over sinners, they and the sorcerers serving the spirits of error and lawlessness. But there are also people who are lowly in the kingdom of this world and do not influence many, yet they also willingly serve demons.