I mean, I could start with the bit over ten thousand years ago where some lakeside village by chance discovered that they could use the shit of the larvae of a moth fed on a certain type of normally poisonous weed to induce abortions and suppress their menstrual cycles, but long story short: I needed to figure out how to get a large quantity of ｃｕｍ to the sperm banks, without the sperm banks knowing whose ｃｕｍ it is, with the added restriction that people would not under normal circumstances simply give away their own ｃｕｍ for free.