4th wave feminism
Came around in the 2010s, about the same time as we started hearing about "toxic masculinity".
Expectations of boys and men that result in them harming themselves and others.
That's the typical online description.
A gentle example would be the pressure for men to not express emotions, resulting in obstacles to communication.
That's also usually written as an example of toxic masculinity.
Lots of scientific studies have consistently shown that it's extremely harmful to not exert control over whe, how and with who you express your emotions. Examples of men expressing their emotions freely, is when men hit people who annoy them, like when their wife has annoyed them.
It's also been shown that people who have been given the impression that they do not have a right to
ever express their emotions, and have also been given the impression that they do not have the right to even
feel those emotions, suffer a lot of problems by suppressing their emotions, and so do their families.
E.G. hearing that "all men are potential rapists" really doesn't make a man feel like it's OK for him to feel horny.
E.G. men who cannot admit weakness, even to the point of not asking for help, because they are afraid that if their girlfriend sees them being scared or lacking confidence about something, she would lose respect for him, think he's a wimp, become completely turned off by him, and start f**king other guys.
A more insidious example would be the pressure for young men to have sex resulting in risky or aggressive sexual behaviour.
1) The challenge for young men is that they are frequently told that:
(a) sex is GREAT, and one of the most pleasurable experiences a man can have,
(b) women can have sex any time they want,
(c) they should consider themselves lucky if ANY woman is willing to sleep with them.
As such, that paints sex for men as something very much in demand but very short on supply, and so they've got to grab every opportunity they can.
2) Another pressure is "friend-zoning". In traditional masculine culture, men would take it slow with a girl they liked, which you can see in the film "The Quiet Man", played by John Wayne, a classical male. But in today's modern culture, connections between men and woman that don't translate quickly into sex, tend to be described by the woman as that they're "just friends", leaving the man often very hurt.
The simplest way to resolve the unnecessary pain and suffering would be to have an honest heart-to-heart with the woman talking openly and honestly about her feelings.
However, failing honest and forthright communication with women who have friend-zoned men, the most practical solution is to hit on women right away. Those who respond positively, become girlfriends. Those who respond negatively, have now settled the matter that there is no chance for a relationship before the man has the time to develop feelings of love and affection for the woman and get hurt by the rejection.
3) Another issue is that generally, women tend to speak about men they've had any form of sex with, as an "ex", but men they've been extremely emotionally intimiate with but haven't had sex with, are not described as "ex"es, which sets the tone of the definition of a relationship with a woman, and who it is fair to have feelings for, by whether the man and woman have had sex or not.
Societal pressures thus dicate that it's invalid to have feelings for a woman, unless the man has had sex with her.
Moreover, if a man has feelings for a woman who he has not had sex with, the assumption is that he has nefarious designs on the woman to take advantage of her. If he and she are supposed to be friends, him having feelings for her is called "creepy" as a result, as if he is waiting until her guard is down before he pounces on her.
4) Then there's the fact that with the removal of social etiquette, there's no formal process for men to meet single women where they can expect that at least one of them would be willing and suitable for a relationship and/or marriage. Men have almost zero education on how to get a girlfriend, or anything like that.
So their hormones are screaming "Breed! Breed!", while their brains are saying "But we don't know what to do!" In the majority, hormones win, and most males do what they can to get a girlfriend, even if it means sometimes doing stuff that might get them thrown in prison.
A significant minority go the other way, avoid engaging in dating, retreat from life in general, and tend to become significantly unproductive compared to their skills and abilities.
Summary:
So all of this and more, is providing lots of environmental and thus evolutionary pressures towards certain obvious outcomes.
Changing the outcomes means removing the environmental pressures.