Context From Original OP:

(…)

My husband was twenty-five years old.

For a young man of twenty-five who should well understand the ways of yin and yang, we have shared the night for six or seven years now, yet I have never once experienced the joy beneath the blankets.

(…)

In terms of outward appearance, my so-called husband looks just like any other man with his face, body, and beard, but when it comes to the matters of the bedroom, he is no different from a monk.

Although he possesses a physical form like a standing tree, he has size but no strength; he hesitates like a timid tiger, proving less effective than the sting of a bee or an insect.

Everyone calls him a useless general.

It is a matter of simple logic that if a general cannot wield his martial arts, the Hangu Pass will never open on its own.

Crossing the Lu River under the cover of night to venture deep into barren lands was a strategy deployed by Zhuge Liang for his military campaign.

However, my husband—who is like a bearded woman—simply stops because he does not know the art of marital union.

(…)

-A casebook of civil complaints, 19 century

This is actually less unusual than one might expect! In societies without no-fault divorce laws, “My husband doesn’t even perform the one duty I, his wife, actually AM expected to receive” pops up from time-to-time as a socially-accepted reason for divorce!