Fascinating. Made me think that maybe the cause of the lowering testosterone levels might be a counterintuitive selection advantage. Maybe women are seeking mates with low T, with knock on effects with each generation. With relatively stable societies and widely available insemination tech, low T levels may not be the reproduction disadvantage that you would think it would be at first glance. And maybe that explains the exaggerated sexuality in current society. Maybe low T men need high heels, form fitting yoga pants, and raunchy talk to be aroused, whereas old style high T men needed but a breath of wind and a thought.