Don't be confused though, it has nothing to do with sexual orientations and there's perfectly happy heterosexual couples where the energies are inverted: males are more emotional, nurturing and females are more detached, analytical and less emotional or nurturing. We're all on a spectrum of that, it's not black and white.
That being said our brains have not evolved with society and genrally we still lean differently on the two sides of the spectrum.
Men are still attracted biologically to what will give them the most chances to procreate: young, healthy women; and women are still attracted biologically to what will give them the most chances to procreate: a strong man, the clan leader, as the role of the man is really most of the protector.
Now my thesis is that as society evolved the more masculine side of the spectrum is increasingly lacking in young men: less ambition, less purpose in life, less indipendence, increasingly abundant feminine traits like emotional neediness and such.
Thus, most women which are also empowered and basically do not need men anymore as a provider find it increasingly hard to find men that project the qualities of the clan leader.