As I mentioned, there are some difficulties. In dealing with a government, they don't like people outside of government interfering. Let them do their own thing. They don't like the idea of child participation because that, itself, is a cultural shift. They tend to think of children as people who should be told things rather than asked things.
Also, when children start talking, they may not necessarily say everything that you would agree with, so that sometimes raises issues. There is push-back in that sense.
I would say there isn't a concerted lobby in favour of prostitution and child sex trafficking, or child sex tourism. At that level there is general agreement, at least at a policy level, but the problem becomes more in the implementation of how you go about actually changing things. It's one thing to get an agreement in principle that people can just walk away from very happily, but it's another thing to actually implement these changes that sometimes can be disruptive.