This brings up an interesting topic: can a rational person do anything that's not for the purposes of ego, or to be more polemic, sex? Hypothetically, if one were to be completely ego-free and also rational, they would have to reconcile that their work and their productions here on earth, are infinitesimal and perhaps negligible on the scale of galaxies. Surely, all human motivations break down at that level, and for a person to continue to be productive, they must admit to the level of "i'll produce something here on earth, that will a.) give me attention (and hence a chance at a more lovely significant other), b.) money (so that I may live comfortably and have a better chance in the future to achieve 'a'." To even claim altruism is to use the adjective to positively light one's ego, no? True altruism would have to function under "rather than doing nothing, i shall do something good, but 'I' do not exist", and under the course of 80 years, any person would succumb to a more aesthetically pleasurable life.