Rape is generally defined as an act that takes place between people. But let's pretend for a second that the concepts of rape and consent can be extended to animals.
Throughout the animal kingdom, most species that rely on mating for reproduction (as opposed to things like externally fertilizing eggs, for example) have complex systems in place for selecting mates. Rape is not common.
Reproduction is our primary goal. It drives all of evolution. More than safety, more than survival, all living things have an innate desire to further their own genetic line. Rape is not a useful means of this, if it were you would see it everywhere, considering animals have had about a half billion years worth of evolution.
Most species have elaborate courtship rituals that have evolved as means of judging the evolutionary fitness of a particular member of the opposite sex - does this reproductive partner provide the best chance possible for me to spread my genes forward through successful future generations. These activities represent an ability to choose a reproductive partner, this constitutes consent.
If rape is the most common form of reproduction, please provide us some examples. 50-100 should suffice (after all, there are 1.5 million species of animal).
As to your question of our genetic predisposition, I don't see any evidence of that. We discovered long ago that we tend to survive better when we engage in a mix of cooperation and competition, and as a society we tend to isolate those who are violent. Being isolated isn't a recipe for evolutionary success.