Rituals involving harvesting the human's soul and then inserting it into a seed of Aushephex, which is an aggregate of two of my kinds' hands and a gemstone. The seed of Aushephex is the way that my species reproduce after everyone's sex organs became useless.
No, our arousal is controlled solely by the brain. The organs are simply unable to serve their intended purpose of reproduction because males don't have function after an incident with a reality altering artifact. Imagine a world of of only feminine looking people.
The person who used the artifact was a freak and wished for our world to be that of only feminine form and males to be infertile. Guy really likes infertile femboys.