It may well have been but take a look at any old images of RAN ships deployed to the tropics in the 60s and 70s and you will see just about everyone working on the upper deck wearing nothing but blue shorts and sandals, we may have been unaware of the cancer risks but we all did it with pleasure.
Yes I was there - 3 months on HMAS Anzac training destroyer waiting for Pilot Course mid 1967, going to Pacific Islands (Tonga / Fiji) via the edge of a cyclone first day out and my first day at sea - sick as a dog. Baking on the fright deck of MELBOURNE on the way back from RIMPAC 1971 - flying finished - big mistake. I know the hazards and await possible consequences of too much sun early on.
Recently had a physical medical emergency requiring hospitalisation for six days; possibly related to my A4G flying days - the catapult was brutal but fun - always looked forward to that 5-6G punch in the chest with a closed fist for about 1.5 seconds. Except at night.
The arrest in about 200 feet was also a shock at first but of course very welcome.
Back at NAS Nowra weather less tropical more cold and drizzle, so no need for anyone to go shirtless - a good thing.