There are alot of answers to that. I myself am a highschool girl, who attends an all-girls school so I know alot about this stuff.
-For alot of girls, they are not confident enough to get out there and be in a male-dominated sport, for the fear of rejection, even though that most guys would be totally excepting of any girl that had enough balls to ski and try to keep up with them.
-Most girls know the risk of pain in skiing, and they do not want to get scratched up, etc.
-Some girls are taught that doing more of the 'extreme sports' as they would call it, are socially inacceptable for women, and they should be doing more 'lady-like' things. This is a big problem in my school.
-Alot of girls aren't attracted to this kind of thing. They would rather be partying, shopping, or anything of that sort.
-Most girls are more fearful than guys, and they think things through alot before doing shit.
Guys, when you find those special girls who are willing and confident enough to rip it up out there, make sure you take them in and are very accepting to them, otherwise it will go nowhere. Show some girls you know ski videos, and ask them if they would like to do that. If they say no, there probably isn't much you can do, except keep encouraging them to do something worthy of their life, rather than just partying and attracting boys as fluff said.
Wachusett Crew