My own feeling is that this was inevitable after the Enlightenment when "Science" gained some kind of godlike status. The Sexual Revolution was begun by pseudo science. See this link
and here Judith Reisman
It just takes time until it gets into people's minds.
Political "Science"? Social "Science"? Thrown in a few equations and people get fooled by the simple word "science". What a joke.
[All of these stupid sciences are just a simple result of Physics -Envy. People too stupid to do the real thing.]
In other words, when the Rambam picks out Physics and Metaphysics to learn, I think he was being exact and very particular. He could easily have picked out other subjects in Aristotle. Why did he pick those two? I suggest he was being as exact and careful as much (and even more so) than he was being in the Mishne Torah as Rav Shach and Reb Chaim Soloveitchik constantly point out.
My feeling about the problem with the sexual revolution is that since it permeates society it gets into one's head-- just because one is automatically drawn after the opinions of people around him.