A great question and lots of really good and agreeable answers.
There is another difference that I did not see anyone write.
Generally speaking, a girl just has to look nice, be in the right places and show interest to attract men. If she does that, she will get what she craves ( attention ). Now, as others have written it may or may not be the kind of man she is attracting is the kind she wants. That is another issue. I have always said, if you dress like a tramp, that is the kind of man you will attract. It is still a minor mystery to me why some , most, women try to look as cheap as is possible. Even at church. When doing that, they only attract men wanting cheap women.
now, for guys, it is different. He can look his best, go to the right places and often times have no opportunity unless he makes the first move. If he is shy, focused on other things ( work, hobbies , etc ) or just does not make it a priority, he ends up alone and single. That partly describe me to a degree. I am normally not focused on meeting someone and that has hurt me relationship wise.
We need to make it a priority if we really want to be with someone.
Now, will make an explaimer here- The guy who looks good and gets out and does not show interest still does attract some women, just only a small fraction though.
good topic and discussion