Mainly its for females, but do found its for males. Mean certain areas of it of course. Anyway, they do have a companion website and blog besides their books.
As for me I have used it time and time again and to me its timeless resource. Even though they do updates of course.
Basically, this is the companion website to their book/s series on this. Have to say all of there book/s are useful reference tool. Not for just for women, but for men as well. By the way they also have a blog called Our Bodies, Our Blog as well.