Case report: She pees in a cup in the library

Miss Conduct [who is also, under her own name, the psychology editor of the Annals of Improbable Research] considers a difficult case. The person who brought it to her attention wrote:

“It has come to my and several co-workers’ attention that a woman who works in our office is locking herself in the library and urinating into a cup, rather than using the ladies’ room.”

Miss Conduct solicited analyses from all her readers, then presented her take on the matter.