In response to the question, "Is this more common?", Yes, I think it is. We don't know the circumstances in this particular instance but the presence of pre-teen boys in women's restrooms and showers has definitely increased. It happened to me twice on our recent trip and a number of times over the past few years. The answer of course, is family showers or individual restrooms but not every campground can make this change right away. My boys would have been absolutely mortified to be in the women's restroom. Everybody would have been forewarned because they would have been kicking and screaming. lizzie