Why do I have so many more girl online tutoring students than boys?

I moonlight doing math tutoring for an online tutoring company. I get about 5 to 10 girl students for every boy. I am happy to help the girls in what is generally considered a guys area. I am curious though about the high ratio of girls to boys. Even if we assume that boys are better at math, and I am not convinced that is the case, it would not account for the disproportion. I have read that lately it is the boys who are struggling in school. For example, most college students are girls. I wonder if that might be a factor.