I've just watched a bit of the BMX cycling at the Olympics, with those dinky little bikes. Having the saddle so low down made me wonder what on earth that was all about so, in my ever present quest for knowledge, I had a quick look online. The first thing I found was this:

https://pedallers.com/why-are-bmx-seats-so-low
"If the seat was higher, the rider would end up hurting the perennial area or genitals which can be extremely painful."

So, now I know that hurting ones genitals can be extremely painful. Isn't the internet a mine of previously unknown information!