I have briefly checked some parts of seasons 1 (Germany) and 2 (Mallorca, Spain).
Pics 1+2 are from season 2 (day 15) and has some Soccer scenes of teen boys in white, medium blue, dark blue and also red shorts (including local boys). Modern shorts, maybe not all shiny or that shiny. At least one pair of red shorts are shiny. The main characters in red shorts in the sea but with a white shirt. Also a woman in red shorts.
Pic 3 is from season 1 (day 19) and has at least 2 shirtless teen boys swimming. One boy in black or dark green or similar shorts, the black boy in yellow shorts. Rating 3-4 only.
For seasons 4+5 see the main entry, rating 6 and 3
Season 3 is in Austria in the snow. That is my favourite season, then season 4. I think s5 also shows teen boys in shorts but I have to recheck it for (notable) shiny shorts. Please also check my other blogs for it.