At 6 to 8 weeks, when the infant brain is developing, baby boy circulate a huge amount of testosterone – four times that of infancy and childhood. If you are carrying a boy, this can dramatically increase your libido. This effect may occur not just at the beginning of your pregnancy but throughout, as testosterone surges continue at regular intervals during gestation.
Niles Newton & Charlotte Modahl, “New Frontiers of Oxytocin Research” in The
Free Woman: Women’s Health in the 1990’s, eds. E. V. Van Hall and W. Everaerd (Can-
forth, England: Pantheon Publishing Group, 1989)