The reason why I presume this is because - the traits to which women are attracted to in men are harder to attain than the other way around. Lets compare.
Confidence
The notion that women like assholes which is thrown around a lot is debunked all of the time by women stating that it's simply the confidence that is attractive. But notice how the opposite doesn't hold true. Men never complain that there's a lack of confident women because most men biologically want women that are more (more than them at least) passive. A part of being masculine is being confident - and confidence by nature is harder to achieve than passiveness because it involves more work and hardship.
Career
Women always look for financially successful partners. One might argue that they are doing this for the sake of their future children but in theory men could do the very same thing, yet they don't. Granted, a hundred years ago working women were looked down upon because a career was considered a man's thing and a woman with a career was considered too masculine so it was expected for them to be jobless one in a relationship so that she could be dependent on her husband. Now the job landscape has changed and so has the mindset of men - men now prefer women that have jobs exactly because they don't want women who would be too dependent on them. But here's the thing - women will almost always choose a man with a more higher paying and successful career, but men just prefer a woman to have at least some kind of job. Even if she's just a cashier or a barber. Yes men don't want women to leech off of them financially but they still instinctually want to be the main bread winners. And a bigger paying career by nature is harder to achieve than a small paying one because it involves more work and hardship.
Approaching
It is socially expected of men to approach. Whenever guys ask, "Why don't girls approach more?" The typical responses are that girls are shy, that they don't want to be awkward, that they fear rejection. But whenever told that exactly the same things apply to men and that men are not made of stone and have feelings as well, and that they'd would like women to cut them some slack..."Just man up and don't be a pussy. It's traditional, you're supposed to do it." An average woman could sit down at the bar and do nothing and she could still expect to be approached by at least one man - most likely not a man she wanted to be approached by, but still. A very attractive woman is pretty much above 90% guaranteed to be approached. An attractive man could maybe be approached by a woman at some point but no average man can expect a woman to walk up to him.
No, I'm not saying that it doesn't happen at all. Kudos to the women that actually do approach. But you are the rare exception, not the norm. Being the one that has to appraoch by nature is harder to do than than being the one that expects to be approached because it involves more work and hardship.
Physical attractiveness
All right. With this one I have less to discuss since this one's a bit more even. I'm not denying that it's hard for women to look like the female in the left part of the picture, but you can't deny that growing muscle is harder. Ok, maybe muscles aren't exactly what women are attracted to in men, but women do like built figures - and in comparison for a man that involves more work than for a woman. And maintaining a built figure by nature is harder to achieve than a lean figure because it involves more work and hardship.
This was my first take so criticize however you want. Feel free to point out how or why I'm wrong or right. And please forgive the poor English, it's not my native language.
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