Another sport where male and female athletes compete in practice is HS wrestling. Girls HS wrestling has been around for a number of years, and women's wrestling was added to the Olympics in 2004. When it started out, most HS's could not field a full girls teams, so it is not uncommon for the girls to practice with the boys. Obviously, coaches need to insure that everyone conducts themselves properly.
Beyond practice, it is not uncommon for girls to actually wrestle boys in competitions, where there are a limited number of girls who compete. This is a Catch-22 if you're a boy wrestling a girl. You're expected to beat her and if you lose, you're marked for life as the guy who lost to a girl.
Years ago, my son wrestled, and while he never had to wrestle a girl, one of his teammates did. I remember that his teammate was pretty upset before the match, expressing his concern about wrestling a girl to his mother. His mother's advice to him was, "Kick her ass!"
You can always count on your mom to say the right thing.....