All humans are descendants of an immortal race with no sexual characteristics.
This race are Aryans. Among other differences between humans and Aryans is no immune system, digestive system, mitochondria, respiratory breathing, or hormone system with hormone secretion implants. There is no need to reproduce if you are immortal. Cloning technology was the only method that was used.
What is evil in reality is death, birth, aging, pain. Microbes were used as genetic bioweapons in the form of bacteria, fungus, and other parasitic micro-organisms. Which caused mutation of DNA and erasing of genetic memory. It wasn't always like this. The good news is that reversal to Aryan DNA is possible. It will not stay this way forever.