Heartstopper has made it clear that no men are allowed to join The Ladies Room but of course anyone can join but I wouldn't break that rule since she's my buddy.
In the Guy's Lounge we have a few 'regulars' that chime in (women that is). The only time I had a problem with it was several years ago a lady was posting on threads she felt were not gentlman-like and scolded us,....well, ok,.....ME specifically, LOL! Other than that I'm okay with women chiming in (though I must admit I'll give them a hard time just to see if they can handle the raunchiness of the room, hahahaha).
In real life my women friends far out number my men friends by 10:1 (estimate, could be higher).