By the by...the photo shown above of Ennis looking up onto BBM from the stream is my favorite few-seconds of image of Ennis in the film. His expression is ever so complex and filled with questioning, yearning, wonderment, fear, confusement, and possibley desire. He has a Brando de Wilde-ish look at this one point that creates an ever greater impression of innocence that in his heart may be at question, at this moment.
Back to subject...very insightful point about the skinny dipping scene. What's more, they "jumped" into the water; they didn't come upon it, like crossing a stream or washing clothes or bathing. Rather, they eagering immersed themselves into this cleansing, freeing, "baptising" ritual that left them each open and literally (and figuratively) totally exposed to one another. It was a reaffirmation of time, place, and emotion. 'We're back...and it's us' sort of a thing.
Cheers!