I don't know if anyone has ever discussed this issue with gym owners, but let me shed some light on female locker rooms: About 99.9% of females don't enjoy being naked around other females. (The other .1% are typically European or grossly confident Exhibitionists.) So, please, people, build some changing rooms. That way I wouldn't have to walk into the locker room to use the bathroom and see some old woman's butt staring back at me. I swear seeing a bare and saggy butt before working out is like eating a chili cheese dog before running a marathon. It just ain't pretty and after about 30 seconds of running I promise, no matter how strong you think you are, you are going to vomit.
And lastly, might I just add a little word to you .1%, who insist on breaking the female code and undressing out in the open: Please for everyone involved, go into a bathroom stall, put up warning tape, change in your car or don't go to the gym. I don't want to see it and, trust me, us 99.9% don't want to either.