Why did schools stop requiring showers after P.E. class?

USA secondary.

At some point, taking a shower after gym class was no longer required. I don't know why or when this happened. I do know school districts continued to build schools with showers in locker rooms, both team showers and general use showers.

I also know that some kids participate in gym class in their regular clothes and could really use a shower, but that's a different story