In certain ancient and not some not so ancient cultures the signs on the restroom doors would be pornographic, because nakedness was the general attire of the day. What would define men's and women's apparel in those cultures? As a pastor, I might just be happy to get some clothes on them!
I wonder if we could appeal to bathroom signs of biblical authority to answer our modesty questions also.
Well, that would put an end to the gender distinction problem!
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Hebrews 13:23 Know ye that our brother Timothy is set at liberty