I'm sorry if this is a late reply, but I was curious on this matter as well, and would like to share this information with those that may still be wondering what Maca does, and have not found a suitable answer.
I found this forum post that talks about Maca root in some detail
http://www.breastnexus.com/showthread.php?tid=11034
also had found information on it from an outside source
http://examine.com/supplements/Maca/
From what I understand from those posts is that Maca is an Adaptogen. that works to keep your hormones in line, for both male and female. It triggers adrenal glands to produce DHEA [Dehydroepiandrosterone], the building blocks for Testoterone, which is what Estrogen is made from. From what I have understood Testoterone builds muscle, but DHT which is made from Testosterone, causes facial and body hair, along with acne, and male pattern baldness. If you take an Anti-androgen it prevents the Testoterone from becoming DHT.
I hope this helps, and thank you to both Isabelle and Gogirlanime for sharing their knowledge on the matter.