Curiosity tends to overwealm us sometimes, but the thing is that when we see boys only or girls only, we tend to have the second thought in our head to why, but the best thing to do is to just respect it and move along, as often there they will be asking questions that only a boy or a girl should answer, and they dont want different due to the embarassement that is assosiated with a question.
For example they are often full of "is it normal" questions, which can only be answered by a certain gender who understands or has experienced such. Like I dont know, is it normal to enjoy chicken nuggets on a sunday while watching trasformers or something. I dont know XD But anyway, best to probably respect the distance, there is tons of other questions here that people would LOVE to have answered instead. A good place to start would probably be the "unanswered" or "recent" section. Doing this will probably make you forget about the other post pretty quick.