Ideology gap increase between young men and women in various countries.

My guess is from a rise in hatred of homosexual men during the aids epidemic in the 80s maybe?

In the US it starts in 1985, which is about a decade after the Vietnam war, which obviously hit men a lot worse then women.

For Germany it was a similar thing. Conscription to fight in the potential war within Germany. So a decent chance of having to fight and die.