Boys are given the impression very early on that they are supposed to be superior to girls. Comments like "you're crying/throwing/acting like a girl" which are used to insult are commonplace. All around them they see more men than women in positions of power. They associate these things with their own maleness and what it means to be male.
When it comes to interaction with girls, the vast majority of boys realise they are not remotely superior to them. This must be confusing. But instead of thinking that there must be something wrong with society, that women are being held back or oppressed in some way, they think there must be something wrong with them. They start to feel
inferior. An unconscious thought process might go something like, "I'm a boy so I'm supposed to be superior to girls, but I'm obviously not. Therefore I must be like a girl and that is bad."
In order then to feel properly male and unlike a girl, the boy needs to find ways to feel superior. This often translates as "getting one over" on the girl, and carries on into adult life. An example of this is the way teenage boys boast about how many girls they've managed to shag. They will then show off about how they got the girls into bed, sharing tactics with each other. Magazines aimed at them, such as Nuts and Zoo exploit this insecure behaviour with articles such as the one explaining how to "trick" your girlfriend into having anal sex. The key word in the article is "trick". It is getting one over on her and feeling superior to her that holds the appeal.
In adult life, many men continue to believe they have to keep getting one over on women to feel that they are a real man. Pornography is so popular precisely because it shows male dominance over women. There's an added bonus if he lies to his partner about his use of pornography; he is getting one over on her. A married man who tells his girlfriend he's about to leave his wife in order to keep her around is getting one over on TWO women, and is therefore very superior and manly.
Often men need to lie about something, however small, in their relationships with women. Perhaps they put a bet on a horse (which puts me in mind of Fawlty Towers! I digress) when they know their partner doesn't like it, just to have a secret from her. Or they go to the pub and tell her they are somewhere else, seemlingly for the sake of it. The deceit is all that's needed to feel superior.
When a man's identity is so tied up in proving his superiority over women (this applies to gay men also, but it manifests in different ways) there will never be complete trust between the sexes. It is also one of the factors that reinforces the subordination of women. We're trapped in a loop and the only way of changing it is through educating children about the real reasons for womens' inferior status in society. Educate them about that thing called patricarchy.
Parents have a particular responsiblity. A friend of mine recently overheard a man say to his son "you're crying like a girl".
Stop it. Just stop it.