I've been teaching at an all girls high school now for about 2 years. I agree with everything that has been said - shy at first, but they warm up to you, create lessons that cater to their interests, etc. The only problem with the teenage girls is that they love to talk, text, snip their split ends in class, and look in the mirror. My girls are actually pretty good, but lazy. At first I did the reward system where I gave out candy and chocolates, but they started to take advantage of it. I talked to my co-teacher and explained that while the girls behaved well, they weren't learning anything or really putting any effort into the work sheets, etc. The best way to get them to really get involved was to make my class worth something (as our classes are usually worth nothing). Anyways, there is this extra 10% my students have for participation and they ended up giving that to me. So right now, it doesn't matter what I teach, the girls work hard and get it done. I suggest talking to your co if you find the interest level or work ethic is low.