I don't know how young boys feel about reading books by women anymore, but I certainly don't think it is as much of a problem as it used to be. Since J.K. Rowling, I think boys probably aren't as bothered about reading books by women.
I don't generally pay a huge amount of attention to whether the book I read is by a man or a woman. In some case I've read books that I thought were written by one gender and turned out to be the other. As well as J.K. Rowling, other female authors I've read are Tove Janssen, Dodie Smith, and a number of the classic writers.