Part of the problem is that for a boy to be a “good boy” he has to be in yeshiva(whether he is cut out to learn or not). For a girl to be a “good girl” she has to dress properly and act properly. It is probably easier to be a “good girl” than a “good boy”.
The solution is to create programs for boys who are not full time learners and then the girls will be willing to go out with them. I realize that for a Talmid Chochom to learn with 20 something working boys does not generate the kovod that a Rosh Yeshiva gets.