shadowolf, I'm glad you brought this up. I've been reading about cases like this a few years ago. I did see a photo of a mutilation victim in Brazil.
From what I gathered from a pathologists who did the autopsies on such cases was that the sexual organs were removed as well as the sexual glands. This is the same thing that is seen removed from cattle mutilations as well. The doctor mentioned that glandular fluids between cattle and humans is very compatible with each other. Also, the victim must be alive for it to taken in the quality they wanted it.
The death is excruciating for both cattle and human according to the pathologist.
If this was the work of a certain group of aliens (Reptoids have been speculated to be responsible for -or are in charge of- these mutiliations) they were very much interested in the glandular fluids of the victims.
This is good enough reason for me to not call attention to oneself if you observe a UFO hovering around your area!!