Yes, there will be an hour once in a while when you won't get to watch the women swim!
Is that going to change your day?
I don't use the Y, I'm an Equinox member, been one for a long time. Prefer the Equinox women wearing the tight Lulu-lemon outfits. Not only does my body get a workout, but so do my eye muscles.
But I used to use the Y frequently in my distant past. And since I used to be a swimmer, I remember that anytime of day I showed up, by law they would have at least three or four lanes open to the public. Sometimes certain lanes would be closed for swim lessons, or senior swimming, or even people with handicaps. And anytime I visited the Y, I knew that I am visiting a Christian based organization. Although I knew that people from all religions, races, and cultures frequented the Y, depending on the surrounding neighborhood the Y is located.
I know that if I showed up to swim one day, and they told me "pool is closed to men" it's women only today, and I peeked in and saw women dressed up in Islamic Shariah swimsuits flapping their fat butts displacing half the pool water, I would get enraged and asked for my membership to be canceled or complained to the manager. I would do the same if I saw a bunch of orthodox Jewish women as well, and I'm Jewish.