That's an interesting proposition you have going. In order to convey the superior sexual attractiveness of rationality we need some sexy rationalists to proselytize. Thank you Carl Sagan! But seriously, the problem might be that basic rationality doesn't translate easily into sexuality, threat, or other emotional appeal. Those things need to be brought in from other skill sets. Rationality can help apply skills and techniques to a given end, but it doesn't give you those techniques or skills.