Who would be weird enough to write an entire book about public toilets? A university professor, of course!
Toilet: Public Restrooms and the Politics of Sharing, published in 2010 (a steal at only $78.64!) forms the argument for an obnoxious new piece in Slate which calls gender-based bathrooms a “Victorian relic”:
It’s easy to think of the push for gender-neutral public restrooms as an issue that matters only to transgender people—after all, they’re the ones left holding their bladders when the stress of constantly using the “wrong” bathroom gets to be too much. But as a straight man, gender-neutral bathrooms matter a lot to me, too—in part because I want the trans community to enjoy the same privileges I do, but also because nothing irks me more than seeing a long line snake out from the women’s room while the men’s room sits vacant, or vice versa. This affront to queuing theory and common sense is never more irksome than when the bathrooms in question serve just one person at a time.
In such spaces, the concepts of a “men’s room” and a “women’s room” are completely imaginary; the room belongs to whoever is in it, although that philosophy didn’t impress the two older women waiting for me when I exited “their” one-toilet restroom at a McDonald’s last summer, nor did it stay the manager they’d convinced to escort me Big Mac-lessly to the parking lot.

