The second one looks like a standard Japaneese bath house scene. You wash yourself before going into the communal hot pool/tub. I'm sure there are experts here who know all about this
The third is a Swedish (?) high school outing in a park by the look of it. There are several series of pics from this location with at least two different groups. And several more series of similar 'fun day' type events in parks , school grounds or out in the country. Stripping down to underwear/swimwear seems to be normal practise, and the girls generally end up topless but covering their tittties. Girls kissing girls seems to be a popular game/dare, often they do this topless and hide their tits by hugging each other chest to chest. Here are some pics taken at the same location, may be a different group though. Sorry I don't remember the original source. Someone posted an album and the pics got copies around the net.
The final pic is from a Japanese soft porn movie. A group of 'schoolgirls' strip and do exercises. I've only previously seen a couple of really low res caps like the one I'm posting. Females lined up and told to strip is one of my fetishes, so I'd love to see more of this scene -- anyone have the full strip sequence
