Oh please. Number One, the more testosterone a guy has the easier he is to control. Every woman knows this. Number two, if human fecundity tanks as you suggest there won't be a population to control in the first place so what are you worried about? Number three, while plastics pollution is certainly a problem and one that has been linked to decreasing fertility in humans, it cannot account for the whole landscape of the fertility problem. There are other things going on.