"affair about" is an acceptable phrase in written English.
It can be used with the meaning of "regarding" or "concerning," as in "We need to have a talk about this affair."
In the early 1860s Swinburne apparently suffered from an unhappy love affair about which little is known.
"At the time of the Festina affair, about 80% of the riders were using drugs either regularly or occasionally.
The plan was to buy Towne Terrace, a boxy, simple affair about three blocks north of Hsieh's apartment, to house the Teach for America recruits in a hurry.
"The Emperor Jones," Limón's 1956 dance version of Eugene O'Neill's play, revived in a new production, is a plodding affair about tyranny, usurpation, paranoia and ignominy.
"This is an affair about caricatures that incite racism," the head of the Great Mosque of Paris, Dalil Boubakeur, told a press conference last week.
The disappointing 2002 sequel, Men in Black II, was a painful affair, about as much fun as eating your 500th Big Mac.
According to the Manhattan prosecutors, Diallo lied with abandon — about facts of the Strauss-Kahn case, about her background, about her financial affairs, about pretty much everything.
But at the time, I grossly overestimated her capacity to answer questions about world affairs, about how her personal points of view were shaped".
And he had a slew of affairs, about which he came clean only after she discovered inexplicable charges on a credit card bill.
The motorcycle increased his status, gave him weight, so that people began calling him Uncle and asking his opinion on world affairs, about which he knew absolutely nothing.
They liked to hold forth on world affairs, about which, leaving the details to their deputies, they took the grand view.
