Admiral,
You choose not to be fat, cos it's bad for you. You have the choice. The knowledge is good. Rape is bad for other people. If the gene is there, in all or some men, should the choice to resist be theirs, an educated one?
Whatever happens, there should be more social 'conditioning'. It's a rare thing, anyway, isn't it? Rarer than theft?
Based on what you just said...
People (not just men) choose not to be rapists because it's bad for both them and the other party involved. They do, in fact, have that choice. The knowledge to not rape someone because it is wrong is easily accessible in may cultures. If a gene existed (which I can't give any more credibility than the idea that Kate Mulgrew is going to jump in bed with me at any moment), the choice is still theirs to make to not rape, and they are educated on it in my many societies.
Rape is not as rare as you would think.