Psychopaths exist across cultures and ethnic groups and at an estimated frequency of about 1 percent of the population for males and 0.3–0.7 percent for females. Some researchers challenge these numbers, citing bias toward male manifestations in diagnostic instruments and methods.
And with psychiatry it's really easy to dismiss mental illness as moral or character failings. I always thought I was a lazy piece of shit but I learned I have clinical depression and ADD.
I was using the greater definition of humans, which includes our ancestors species. They were still human beings, but not homo sapiens.
"Early humans first migrated out of Africa into Asia probably between 2 million and 1.8 million years ago. They entered Europe somewhat later, between 1.5 million and 1 million years. "
It sounds like you may have read somewhere that rape victims sometimes reenact their rape with their partners and concluded that therefore they must like being raped.
You couldn't be further from the truth.
For your information, they don't do it because they enjoyed their rape so much, they do it because it helps them work through what happened to them with a partner they trust and where they have complete control over the situation and the outcome unlike what happened to them prior.