Or it's something that is failing to attract girls to computer science and the only reason to study the subject is because you want to do more of it. Otherwise there are plenty of alternatives that leave your options open.
To draw a parallel that may be relevant:
My older daughter did maths A-level because she could get a good grade and it would support what she wanted to do at university. College tried very hard to get her to do further maths, but she refused. Her maths class was predominantly male, but it was nowhere near a 5:1 ratio (possibly 2:1 or even lower).
My younger daughter is currently doing further maths because she and, I gather, most of the others in the class want to explore maths for its own sake. The male:female ratio is just over 4:1. On the other hand, her chemistry class is close to parity, but is mostly people that are not interested in the subject but need it for what they want to do next (medicine etc).
The point really, is that until computer science is an option that enables further study of other subjects it will only attract those that want to do computer science later on. For some reason that doesn't happen with many girls when they still have time to choose it.