Then you create girl groups for the same girls to look up to and admire like they are sisters or bffs.
If you want to make some serious money in the music industry then you create boy groups that will create passionate fandoms of girls who will do anything for their oppas. They are the ones that pretty much invented fandom culture going as far back as Elvis and The Beatles and probably even further back then that. It's a fact that kpop from the very beginning has been strictly aimed at teenage girls only.