So I think there is this point where as an individual or society one can switch contexts easily and readily between apparent contradictions. In this case being naked is not the same as sex. Contrast that with the fetish parades or even some aspects of the pride parades where nakedness is sex. Anyhow, it looks like they are losjng their "innocent" context switching abilities due to “awareness” by media exposure, advertising, tourists, global norms, etc.