Morning
"I have an interesting situation with my son. He's been on the swim team for three years and this year for the first time ever there is a female coach. The issue is that she goes into the locker room when the guys are naked. He says she doesn't do anything weird but it makes most of them uncomfortable - especially if anyone chubs in the showers. He asked what to do about it. A talk with the head coach hasn't helped. He thinks they should deal with it the way pro athletes have to. They all like her well enough and don't want to stir up any shit because she's a really good coach. Ideas?"
It's true that the idea of women in pro team locker rooms is fairly common now. But, again, they're pro players.
If they don't want to cause a big ruckus: Does the team have a "manager" - you know, the guy who doesn't compete but helps out making sure everyone is set and has what they need? If so, I'd post him outside the locker room. When that new coach approaches, he pops in and yells, "Towel up!"
