In Europe people are much less self conscious and much more carefree than here. I grew up in Italy wearing speedos at the beach since I was a kid, my dad always used speedos till he died swimming in the ocean when he was 75!
I think it means you don't give a shit of what other people can think, you go to the beach to enjoy yourself, with an amazing muscular body or with a belly.
And by the way, if a man doesn't have the body for a speedo, according to the criteria of what a nice male body should look like, DEFINITELY he doesn't even have the body for beach trunks!
I will be 60 in 2 years, whenever I go to the beach I use speedos, no matter where I am and what people can think. I can't stand swimming with those knee long trunks!
Actually I am a big fan of nude beach....