I grew up in a wealthy suburb of Detriot. Ever since 1928, starting in 6th or 7th grade all of the schools had swimming classes and required nude participation for all boys swim classes and boys swim teams. It was also required that a soap shower be taken before swim class. The water qulaity toady suffers somewhat despite better filtration technology and greater maintance expenses since many use the pool as a bath tube and wear dirty gym shorts then feel the need to take a shower AFTER swimming. This is just the total reverse of what logically makes sense.