So DS's swimming teacher tells me.
Generations of children have learnt to swim with knitted swimming costumes, but now apparantly, they have evolved to be unable to learn to swim unless their mothers go out and spend a tenner on a pair of tight trunks, even though he has 3 pairs of perfectly respectable shorts-type trunks.
And it now takes at least three years to teach a child to swim, although I learnt in about six weeks, from what I recall. And when I learnt, we were taken by our schools for free as part of our education, to the local swimming pool, whereas now, children have to be taken by their mothers at vast expense and copius numbers of swimming trunks, dodgy swimming hats which have to be covered in talc before you can get them on their heads, and goggles.
Progress is a fine thing, is it not?