I love the controversy, but an ACTUAL Speedo suit has a front panel lining.
This is from one of those "underwear and swimwear websites", and it is meant to show off your junk, which in his case, is helpful.
Of course, women get away with more provocative attire, and straight men are upset at seeing his dick. If the women are not allowed one thin layer showing pussy lips, the gym has a point.
More information about text formats