>>43825976Anon, allow me to introduce you to sounding.
Also, interesting thing. In typical pools and the ocean, the salt/chlorine levels are low enough that there is no irritation due to contact with genitals.
However, I went swimming in a high-salinity lake in Senegal a few years ago. The girls all felt a sharp irritation of their nether regions, and so did one of the guys, but not the others. The one guy lacked a foreskin, so I guess that makes a difference.