The boy is always in a no-win situation. When he wins - he beat a girl. When he loses - he lost to a girl.
Either way, he doesn’t win.
Hey we had boy/girl wrestling when I was in High school!
Okay, it was usually after school and the girl was sometimes a reluctant participant.
We called it “dating”!
The corollary to that is that either way, she wins.
I've got no problem with boys and girls competing in non-contact sports and there are plenty of them-- softball, tennis, ping-pong, baseball.
But I see no way to take down a girl without there being a sexual connotation.
I say let the girl win. It’s a good lesson for later life (if you want one).