More like "do not multiply unnecesary entities." Considering Ockham was a Christian theologian, he believed God was the only necessary entity. If fire burns wood, it's not because of inherent properties in either, but because God willed it to happen that one time. That attitude's sometimes crippling to science, and I've wondered how Ockham was ripped out of context and stuck into the scientific toolkit.
As for the topic: there are lots of scientists denouncing any claim that rape has a genetic basis. Somehow I've only come across the denunciations, and not the original research, so worried are they that rapists will start agitating for special rights.
If there is a genetic component to rape, then a pill should be developed for people who test positive for this gene, so that they will be more likely to have normal sex lives.