Selection is also happening because of pheromones.

You'd have to believe that with decreasing testosterone the pheremone signals from males is diluted.

Because not only is the signal lost on a females "reception" pheromones, it affects their "broadcast" pheromones.

Since women both broadcast and select by virtue of their own signals, and those of males, it also affects the male because the male only selects by virtue of a women's reception.

Seems like a terrible feedback loop.