??!? Testosterone is mostly produced in the testicles. In women, most T is produced in the ovaries, although the amount is much less than in men.
Women invest more in children because they know their offspring are theirs. Until DNA testing, men never really knew who parented their female partner's offspring. Also, women have a very limited supply of eggs, whereas men produce millions of sperm every day, so they have an opportunity to spread their genes around and improve their odds. That's why males are tempted to be promiscuous, and to switch to younger women as they age.
The dumb males do!
The smart ones know about paternity suits, child support payments and wage garnishment.
I believe your right. IMHO, the author is probably confusing the specific hormone receptors, which are needed to complete a negative feedback inhibition loop, with the hormones.