My uncle is a bit younger than you and he was also a swimmer. He told me a lot of guys wore jocks (swim jocks) under their speedos in the 60s and early 70s. His dad told him he needed it. Speedos then were typically a bit looser nylon and the bits did show. Somewhere here a while back there was a thread on jocks under speedos. It was largely for modesty and especially if you got a boner or semi.
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