Ooops Alixir,
I wouldn't have thought someone from Switzerland would have "Speedophobia". That's usually reserved for people of Anglo-Saxon provenance.
Heh, heh, ya gotta realize that to guys from most parts of the world, trunks or slips or briefs
are bathing suits, and the shorts that people here in Canada & the USA have the temerity to call swimsuits are only for street wear. An anecdote might illustrate. I have a friend here in Toronto, a church minister, who tried to help out a French buddy during a visit to Normandy. Everybody had decided spontaneously to head over to the beach, but this guy had no bathing suit packed, so our minister friend, who had 2 with him, offered to lend him his extra one (in selfless Christian compassion, not minding having someone else's nether regions occupy his swimming togs

)
When John pulled out his Canadian style shorts out of his suitcase, the look of horror that came over the guy's face was priceless. He said that the thing John was showing him wasn't a bathing suit & he'd rather not be seen wearing it in the water, and he would just take a walk around town & meet us all at the restaurant later . . . what can you say?
In fact, in a lot of pools in France they have signs saying thing like "slip de bain obligatoire" or they'll have a cartoon of shorts & T-shirts & skirts with a red x through them, and/or briefs with a green checkmark, and you're not even allowed to be on the pool deck in street clothes (as in, non-lycra shorts). In fact, you see signs like those in lots of places. I thought I would try attaching one from Malaysia (see below)
Anyhow, this may be one trend that may be too big for one person to tackle :head - your only solution may be to move to N. America.
I must confess to having a small advantage, too, , even though my family background is WASP Canadian. I'm a biologist, and so I guess the "biology" one sees when guys (and gals) wear lycra suits just rolls off my back- doesn't interfere with my breath-up, breathe-down, or much of anything else, for that matter